import java.util.Scanner;
class main {
public static void main(String [] args) {
Scanner kb = new Scanner(System.in);
System.out.print("? ");
int num1 = kb.nextInt();
boolean res = isprime(num1);
System.out.println(res);
}
public static boolean isprime(int num1) {
boolean ans = true;
int i = 1;
for(i = 2;i < num1;i++) {
if((num1 % i == 0) && (num1 != 2)) {
ans = false;
break;
}else{
ans = true;
break;
}
}
return ans;
}
}