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