#include <bits/stdc++.h>
using namespace std;
int main(void) {
  int a[3];
  cin >> a[0] >> a[1] >> a[2];
  sort(a, a + 3);
  if (a[0] + a[1] == a[2])
    cout << "yes\n";
  else
    cout << "No\n";
  return 0;
}
