#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using lint = long long;
const lint inf = 1e18 + 7;
const long long MOD = 1000000007;
signed main() {
  vector<long long> a(3);
  for (long long i = 0; i < 3; ++i) cin >> a[i];
  sort(a.begin(), a.end());
  if (a[2] == a[1] + a[0]) {
    cout << "YES" << endl;
  } else {
    cout << "NO" << endl;
  }
  return 0;
}
