#include <bits/stdc++.h>
using namespace std;
using ll = long long;
template <class T>
using V = vector<T>;
template <class T, class U>
using P = pair<T, U>;
using vll = V<ll>;
using vvll = V<vll>;
template <class T>
inline bool chmax(T& a, T b) {
  if (a < b) {
    a = b;
    return true;
  }
  return false;
}
template <class T>
inline bool chmin(T& a, T b) {
  if (a > b) {
    a = b;
    return true;
  }
  return false;
}
const ll MOD = 1000000007;
const ll HIGHINF = (ll)1e18;
int main() {
  vll abc(3);
  for (ll i = 0; i < (ll)3; ++i) cin >> abc[i];
  if (abc[0] + abc[1] == abc[2])
    cout << "Yes" << endl;
  else
    cout << "No" << endl;
  return 0;
}
