#include <bits/stdc++.h>
using namespace std;
int main(void) {
  vector<int> c(3);
  cin >> c[0] >> c[1] >> c[2];
  sort(c.begin(), c.end());
  if (c[0] + c[1] == c[2])
    cout << "YES" << endl;
  else
    cout << "NO" << endl;
  return 0;
}
