public class Practice {


	public static void main(String[] args) {

	   if(args.length!=3) {
       	      System.exit(1);
           }


           int operand1 = Integer.parseInt(args[0]);
	   
	   char operator = args[1].charAt(0);

	   int operand2 = Integer.parseInt(args[2]);


           int ans = process(operand1, operator, operand2);
	
	   System.out.println(ans);
     }

     private static int process(int op1, char operator,
					int op2) {

	int ans = 0;

        switch(operator) {
		case '+':
		   ans = op1 + op2;
		   break;
		case '-':
		   ans = op1 - op2;
		   break;
		case '*':
		   ans = op1 * op2;
                   break;
		case '/':
		   ans = op1 / op2;
                   break;
                default:
		   System.err.println("Unknown operation.");
		   System.exit(1);
		   break;

        }
	return ans;



     }
}