import java.util.*;
import java.io.* ;

class start {
   static String again;
   static float div;
   public static BufferedReader reader;
   public static void main (String args[]) throws IOException {
   reader = new BufferedReader(new InputStreamReader(System.in));
  
           do {
    	   System.out.println('\n' + "Vlozte (1) pre kalkulacky, (2) pre priemer.");
    	   String dec1 = reader.readLine();
    	   int dec2 = Integer.parseInt(dec1);
    	     if (dec2 == 1)
    	     {
         System.out.println("Vlozte (1) pre numericku kalkulacku, (2) pre euro kalkulacku:");
         String decision = reader.readLine();
         int decision2 = Integer.parseInt(decision);
         if(decision2 == 1) {
         System.out.println('\n' + "Vybrali ste si numericku kalkulacku.");
         
         

      System.out.println("Vloz prve cislo:");
      String num1 = reader.readLine();
      float n1 = Float.parseFloat(num1);

        System.out.println("Vyber si operaciu: (+, -, *, /)");
        String op1 = reader.readLine();
        char op2 = op1.charAt(0);
             
          System.out.println("Vloz druhe cislo:");
          String num2 = reader.readLine();
          float n2 = Float.parseFloat(num2);
            
           try {          
           if (op2 == '+') { 
            float plus;
            plus = n1+n2;
            System.out.println('\n'+ "Sucet je: " + plus);
                           }
               }
      catch(ArithmeticException v) {
            System.out.println("Chyba: " + v.getMessage());
                                   }
           
           
           try {        	  
           if (op2 == '-') {
            float minus;
            minus = n1-n2;
            System.out.println('\n'+ "Rozdiel je: " + minus + ".");
                           }
               }
      catch (ArithmeticException v) {
             System.out.println("Chyba: " + v);
                                    }
           
           
           try { 
           if (op2 == '*') {
            float mult;
            mult = n1*n2;
            System.out.println('\n'+ "Sucin je: " + mult + ".");
                           }
               }
      catch (ArithmeticException v) {
             System.out.println("Chyba: " + v);
               }
           
           
           try {
           if (op2 == '/' && n2 == 0) 
            throw new ArithmeticException ("Delenie nulou.");  
           if (op2 == '/' && n2 != 0) {
            div = n1/n2;
            System.out.println('\n'+ "Podiel je: " + div + ".");          
                                      }
               }
      catch (ArithmeticException v) {
             System.out.println("Chyba: " + v.getMessage());
                                    }
               }
      
     
      if (decision2 == 2) { 
       System.out.println('\n' + "Vybrali ste si euro kalkulacku.");
       System.out.println("Vlozte pocet eur: ");
       String euro = reader.readLine(); 
       int euro2 = Integer.parseInt(euro);
       
    	   try {
    	   if (euro2 == 0 || euro2 > 4)
    	    System.out.println(euro2 + " eur je priblizne " + euro2*30 + " korun.");
    	   if (euro2 == 1)
    	    System.out.println(euro2 + " euro je priblizne " + euro2*30 + " korun.");
    	   if (euro2 == 2 || euro2 == 3 || euro2 == 4)
    	    System.out.println(euro2 + " eura su priblizne " + euro2*30 + " korun.");
    	       }
      catch (ArithmeticException v) {
    	     System.out.println("Chyba: " + v);
    	                            }
    	                  }
    	     }

         
      if (dec2 == 2) { 
 	   System.out.println('\n' + "Vybrali ste si priemer znamok.");
       System.out.println("Vyberte si Vas pocet znamok (2-5):");
                     }
       String pocet1 = reader.readLine();
       int pocet2 = Integer.parseInt(pocet1);
      
           try {
           if (pocet2 == 5) {  	          
            System.out.println("Vlozte prve cislo:");
            String c1 = reader.readLine();
            float c2 = Float.parseFloat(c1);
      
             System.out.println("Vlozte druhe cislo:");
             String c3 = reader.readLine();
             float c4 = Float.parseFloat(c3);
      
              System.out.println("Vlozte tretie cislo:");
              String c5 = reader.readLine();
              float c6 = Float.parseFloat(c5);
      
               System.out.println("Vlozte stvrte cislo:");
               String c7 = reader.readLine();
               float c8 = Float.parseFloat(c7);
      
                System.out.println("Vlozte piate cislo:");
                String c9 = reader.readLine();
                float c10 = Float.parseFloat(c9);
      
      System.out.println("Vas priemer je: " + (c2 + c4 + c6 + c8 + c10)/5);
                            }
      
           if (pocet2 == 4) {
	        System.out.println("Vlozte prve cislo:");
	        String c11 = reader.readLine();
	        float c12 = Float.parseFloat(c11);
	         
	         System.out.println("Vlozte druhe cislo:");
	         String c13 = reader.readLine();
	         float c14 = Float.parseFloat(c13);
	         
	          System.out.println("Vlozte tretie cislo:");
	          String c15 = reader.readLine();
	          float c16 = Float.parseFloat(c15);
	         
	           System.out.println("Vlozte stvrte cislo:");
	           String c17 = reader.readLine();
	           float c18 = Float.parseFloat(c17);
	     
	  System.out.println("Vas priemer je: " + (c12+c14+c16+c18)/4);
                             }
      
	       if (pocet2 == 3) {
 	        System.out.println("Vlozte prve cislo:");
 	        String c19 = reader.readLine();
 	        float c20 = Float.parseFloat(c19);
 	         
 	         System.out.println("Vlozte druhe cislo:");
 	         String c21 = reader.readLine();
             float c22 = Float.parseFloat(c21);
 	         
              System.out.println("Vlozte tretie cislo:");
              String c23 = reader.readLine();
 	          float c24 = Float.parseFloat(c23); 
 	 
 	  System.out.println("Vas priemer je: " + (c20 + c22 + c24)/3);
	                        }
	     
           if (pocet2 == 2) {
            System.out.println("Vlozte prve cislo:");
            String c25 = reader.readLine();
            float c26 = Float.parseFloat(c25);
     	         
             System.out.println("Vlozte druhe cislo:");
             String c27 = reader.readLine();
             float c28 = Float.parseFloat(c27);
      
      System.out.println("Vas priemer je: " + (c26 + c28)/2);
                            }
               }
      catch (ArithmeticException v) {
             System.out.println("Chyba: " + v);
                                    }
      
             System.out.println('\n' + "Opakovat? a/n");
             again = reader.readLine();
             }
             while (!again.equals("no"));
   }
}