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