func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     long long int n, m, i, j, k, l, p = 0, q, x, y, z;     scanf( %lld %lld %lld %lld , &n, &m, &k, &l);     x = l * 2;     x = min(x, n);     i = x / 2;     for (; i >= 0; i--) {       x = i * 2;       x = n - x;       x = min(x, k);       for (j = x; j >= 0; j--) {         y = (i * 2) + j;         y = n - y;         y *= 2;         if (y <= m) p++;       }     }     printf( %lld , p);   }   