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