func_code_string: #include <bits/stdc++.h>   using namespace std;   long long v[3], l, ans, minusVal;   long long accSum(long long limit) {     return (limit + 1LL) * (limit + 2LL) / 2LL;   }   long long invalidCase(long long a, long long b, long long c) {     long long ret = 0LL;     for (long long i = 0LL; i <= l; i++) {       long long val = min(c - a - b + i, l - i);       if (val >= 0LL) ret += accSum(val);     }     return ret;   }   int main() {     scanf( %lld %lld %lld %lld , &v[0], &v[1], &v[2], &l);     ans = (l + 1LL) * (l + 2LL) * (l + 3LL) / 6LL;     ans -= invalidCase(v[2], v[1], v[0]);     ans -= invalidCase(v[0], v[2], v[1]);     ans -= invalidCase(v[0], v[1], v[2]);     printf( %lld n , ans);     return 0;   }   