#include <bits/stdc++.h>
using namespace std;
int main() {
  int a[3];
  for (int i = 0; i < 3; i++) cin >> a[i];
  sort(a, a + 3, greater<int>());
  if (a[0] == a[1] + a[2])
    cout << "YES" << endl;
  else
    cout << "NO" << endl;
}
