#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%5");
    }
    return 0;
}