#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 (years>10){
        printf("15%%");
}
return 0;
}