#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);
  if (a[0] + a[1] == a[2])
    cout << "YES";
  else
    cout << "NO";
}
