#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{
        print("15%%");
    }
    return 0;
}