#include <iostream>
using namespace std;
int main()
{
    int N = 15, cnt = 0;
    for (int x = 1; x + x + x <= N; x++)
        for (int y = x; x + y + y <= N; y++)
            for (int z = y; x + y + z <= N; z++)
                cnt++;
    cout << cnt << endl;
    return 0;
}