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