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