#include <bits/stdc++.h>
using namespace std;
using P = pair<int, int>;
using ll = long long;
int main() {
  int a[3];
  for (int i = 0; i < (int)(3); i++) {
    cin >> a[i];
  }
  cout << (a[0] + a[1] == a[2] ? "Yes" : "No") << endl;
  return 0;
}
