#include <stdio.h> 
int main() {
    int years; 
    scanf("%d", &years);

        if (years < 0 || years > 40) {
        printf("Invalid Input\n");
    }
    
    else if (years < 1) {
        printf("Invalid Input\n"); 
    }

    else if (years >= 1 && years <= 5) {
        printf("5%%\n");
    }
    
    else if (years >= 6 && years <= 10) {
        printf("10%%\n");
    }
    
    else { 
        printf("15%%\n; 
    }

    return 0; 
}