#include <bits/stdc++.h>
using namespace std;

int main() {
    int m, a, b, c, d, e, f, g, h, i, j, k;
    cin >> m;
    a = 100 - m;
    b = m % 6;
    c = b % 3;
    g = a % 6;
    h = g % 3;
    if (c % 2 == 0)
        d = m / 6;
    return 0;
}
/**************************************************************
	Problem: 1344
	User: fuhoubin
	Language: C++
	Result: Wrong Answer
****************************************************************/