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