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