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