#include<stdio.h>
int main()
{
    int years;
    scanf("%d", &years);
    if(years < 1);
    {
        printf("Invalid input");
    }
    else if(years >= 1 && years <= 5){
    printf("5%%\n");
    }
    else if((years >= 6 && years <= 10){
        printf("10%%\n");
    }
    elseif(years >= 10 && years <= 40){
         printf("15%%\n");
    }
    else{
        printf("Invalid Input");
    }
    return 0;
}