#include <stdio.h>

int main() {
    
    scanf("%d", &year);
if (years < 1) {
    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;
}