#include<stdio.h>
int manin() {
    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 if (years > 10){
        printf("15%%");
    }
    return 0;
}