#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 if(years<<1){
        printf("Invalid input");
    }
    return 0;
}