#include<stdio.h>
int main(){
    int years;
    scanf("%d",&years);
    if(years<=1&&years=5)
    printf("5%");
    else if(years<=6&&years=10)
    printf("10%");
    else if(years>10)
    printf("15%");
    else
    printf("Invalid Input");
    return 0;
    
}