#include <bits/stdc++.h>
using namespace std;
int32_t main() {
  ios::sync_with_stdio(false), cin.tie(0);
  ;
  long long a[3];
  cin >> a[0] >> a[1] >> a[2];
  if (a[0] + a[1] == a[2])
    cout << "Yes\n";
  else
    cout << "No\n";
}
