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