#include <bits/stdc++.h>
using namespace std;
using ll = long long;
const double pi = acos(-1);
template <typename T>
ostream& operator<<(ostream& os, const vector<T>& v) {
  for (ll i = (0), __last_i = (v.size()); i < __last_i; i++) {
    if (i) os << " ";
    os << v[i];
  }
  return os;
}
template <typename T>
ostream& operator<<(ostream& os, const vector<vector<T>>& v) {
  for (ll i = (0), __last_i = (v.size()); i < __last_i; i++) {
    if (i) os << endl;
    os << v[i];
  }
  return os;
}
int main() {
  ll a, b, c;
  double sum, s;
  string ans;
  cin >> a >> b >> c;
  sum = a + b + c;
  s = sum / 2;
  if (s == a || s == b || s == c) {
    ans = "yes";
  } else {
    ans = "No";
  }
  cout << ans << endl;
}
