include<stdio.h>

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