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

int main()
{
    int n;
    cin >> n;
    
    int counter = 0;
    
    for (int i = 0; i <= n; ++i) {
        for (int j = 0; j <= n; ++j) {
            int k = n - i - j;
            if (k >= 0) ++counter;
            else continue;
        }
    }
    
    cout << counter << "\n";
    
    return 0;
}