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