#include <stdio.h>

void wait_for_key_press(char *msg)
{
     int input;
     puts(msg);
     while((input = getchar()) != '\n' && input != EOF); 
}

int main()
{
    int num;
    scanf("%d", &num);
    printf("%d", num+20);
    
    wait_for_key_press("Press to continue...");
    return 0;
}