#include <bits/stdc++.h>
using namespace std;
int main() {
  int a, b, c = 0;
  cin >> a >> b >> c;
  int m = 0;
  int w = 0;
  m = max({a, b, c});
  w = a + b + c;
  if (w == (2 * m)) {
    cout << "YES" << endl;
  } else {
    cout << "NO" << endl;
  }
  return 0;
}
