#include<iostream>
#define rep(i, n) for(int i = 0; i < n; ++i)
using ll = long long;
using namespace std;
int main(){
    ll n, ans = 0;
    cin >> n;
    rep(i, n + 1){
        rep(j, n + 1){
            if(n - i - j >= 0)++ans;
        }
    }
    cout << ans << endl;
    return 0;
}