func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int a, b, c, d;     cin >> a >> b >> c >> d;     int k = a + b + c + d;     if (k % 2 == 0) {       if (a + b == k / 2 || a + c == k / 2 || a + d == k / 2 || b + c == k / 2 ||           b + d == k / 2 || c + d == k / 2 || a + b + c == k / 2 ||           a + b + d == k / 2 || a + c + d == k / 2 || b + c + d == k / 2)         cout <<  YES n ;       else         cout <<  NO n ;     } else       cout <<  NO n ;     return 0;   }   