#include <bits/stdc++.h>
using namespace std;
template <class S, class T>
istream& operator>>(istream& is, pair<S, T>& p) {
  return is >> p.first >> p.second;
}
const double EPS = 1e-10;
const double PI = acos(-1.0);
const long long MOD = 1e9 + 7;
int main() {
  cin.tie(0);
  ios_base::sync_with_stdio(false);
  vector<int> xs(3);
  for (int i = (0); i < (3); ++i) cin >> xs[i];
  cout << (xs[0] + xs[1] == xs[2] ? "Yes" : "No") << endl;
  return 0;
}
