#include <bits/stdc++.h>   using namespace std;   int main() {     int a, b, c, n;     cin >> n >> a >> b >> c;     int count = 0;     for (int i = 0; i <= b; i++) {       for (int j = 0; j <= c; j++) {         int num = n - i - 2 * j;         if (num >= 0 && 2 * num <= a) count++;       }     }     cout << count << endl;   }   