#include <bits/stdc++.h>
using namespace std;
int main() {
  vector<int> C(3);
  cin >> C[0] >> C[1] >> C[2];
  sort(C.begin(), C.end());
  if (C[0] + C[1] == C[2]) {
    cout << "YES" << endl;
  } else {
    cout << "NO" << endl;
  }
  return 0;
}
