import java.io.*;

public class PlayTime // This program takes a pair of integers and returns their sum or product etc.
{
  public static void main (String [] args) throws Exception
  {
    InputStreamReader ca = new InputStreamReader (System.in);
    BufferedReader va    = new BufferedReader (ca);				// Thus we've connected the input stuff
    PrintWriter bon      = new PrintWriter (System.out, true);	// and here the output is connected

    int x=0, y=0, z=0;		// x and y are for the input integers, and z for the answer
    int tries;				// this is to allow the user a finite number of silly inputs
    int MAX_TRIES=3;		// this sets the max number of tries
    char repond1='q', repond2='q'; 	// repond1 is for the arithmetic operator, repond2 is for repeat options
    String op_string;
    boolean success;
    
    String oops   = "Sorry, I didn't understand what you typed";  	// various useful strings
    String regoof = ".  Try again (you have ";
    String ask    = "Enter an integer ";
    String ask_op = "Enter the symbol (+,-,*,/,or %) for your desired calculation.";
    
    do		// this do-while loop performs the calculation, and allows for the repeating of the program.
      {
      tries = 0;		// they haven't tried and messed up yet!!!  This is reset for each new calculation.
      success = false;	// for new calculations they must (again) succeed in acquiring the data.44
    	
      while (tries <= MAX_TRIES && !success)
        {
    	success = true;		// thus success is only false if repond1 fails to be +, -, *, /, or %
    		
    	bon.println(ask + "x.");		// we ought to check that what they type is an integer!
        x = Integer.parseInt (va.readLine());			// this acquires the first integer
        bon.println(ask + "y.");		// checking for ints is best done by catching exceptions
        y = Integer.parseInt (va.readLine());			// this acquires the second integer
        bon.println(ask_op);
        op_string = va.readLine();
        if (op_string.length() >= 1) repond1 = op_string.charAt(0);	// this acquires the desired operator
        else success = false;	// so if they don't type anything, we don't try to get the 1st character!
            
        if (success) 	// so don't bother getting more stuff if they've already goofed!
		  {
            switch (repond1) 	// do the actual calculations!!!
			{
			case '+': z = x + y; break;  // what would happen if we didn't have these 'breaks'?
			case '-': z = x - y; break;
			case '*': z = x * y; break;
			case '/': z = x / y; break;
			case '%': z = x % y; break;
	        default : success = false;
			}
		  } // end of answer-calculating 'if' section
        if (!success) // note that this catches goofy 'operators' as well as 'empty' ones
          {
          bon.print(oops);
          tries++;	// thus set to 1 for the first bad attempt -- incremented each mess up
          if (tries == 1) bon.println(regoof +MAX_TRIES + " tries left).");
          else if (tries < MAX_TRIES) bon.println(" again" +regoof +(MAX_TRIES - tries + 1) + " tries left).");
          else if (tries == MAX_TRIES) bon.println(" again" +regoof + "one try left).");
          else bon.println(" again.  Too many errors -- a bientot!");
          } // end of complaining-to-user 'if' section
            
       } // end of while loop -- exit loop if too many tries (>3) or success == true
    	
      if (success) 	// so only show an answer if inputs are successful!!
        {
        bon.print("x was " + x + " and y was " + y);
        bon.println(" so z = x " + repond1 + " y is " + z + ".");
        bon.println("run again?");		// note they're only invited to run again if successful!
        repond2 = (va.readLine()).charAt(0);
      } // end of answer-display code, governed by 'if'

    } while (repond2 == 'y' && success); // end of do-while loop for allowing re-running the program.
    
    bon.println("Au revoir!");
    ca.close();
  } // end of main method
}  //end of class PlayTime