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import java.util.Scanner;

public class Calculator {

public static void main(String args[]) {

Scanner sc = new Scanner(System.in);

int a = sc.nextInt();

int b = sc.nextInt();

int operator = sc.nextInt();

/**

* 1 -> +

* 2 -> -

* 3 -> *

* 4 -> /

* 5 -> %

*/

switch(operator) {

case 1 : System.out.println(a+b);

break;

case 2 : System.out.println(a-b);

break;

case 3 : System.out.println(a*b);

break;

case 4 : if(b == 0) {

System.out.println("Invalid Division");

} else {

System.out.println(a/b);

}

break;

case 5 : if(b == 0) {

System.out.println("Invalid Division");

} else {

System.out.println(a%b);

}

break;

default : System.out.println("Invalid Operator");

}

}

}