#include <iostream>
using namespace std;

int main() {
    int age;
    cin >> age;
    int total;
    if (age >= 10) {
        total = 25 * 5 * 3;
    } else if (age >= 7) {
        total = 15 * 5 * 3;
    } else {
        total = 5 * 5 * 3;
    }
    int bottles = (total + 119) / 120; 
    cout << bottles << endl;
    return 0;
}
/**************************************************************
	Problem: 1310
	User: fuhoubin
	Language: C++
	Result: Accepted
	Time:9 ms
	Memory:2072 kb
****************************************************************/