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