#include <bits/stdc++.h>
using namespace std;
const int MOD = 1000000007;
int main() {
  int a, b, c;
  cin >> a >> b >> c;
  (a + b) == c || (a + c) == b || (b + c) == a ? cout << "YES" << endl
                                               : cout << "NO" << endl;
  return 0;
}
