#include <bits/stdc++.h>
using namespace std;
int a, b, c;
int main(int argc, char const *argv[]) {
  ios_base::sync_with_stdio(false);
  cin >> a >> b >> c;
  cout << (a + b == c || b + c == a || c + a == b ? "YES" : "NO") << endl;
  return 0;
}
