#include <bits/stdc++.h>
using namespace std;
const long long mod = 1e9 + 7;
int main() {
  vector<int> a(3);
  cin >> a[0] >> a[1] >> a[2];
  sort((a).begin(), (a).end());
  if (a[0] + a[1] == a[2]) {
    cout << "YES" << endl;
  } else
    cout << "NO" << endl;
  return 0;
}
