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