#include <bits/stdc++.h>
using namespace std;
using ld = long double;
using ll = long long;
const ll INF = 10010010010;
const ll mod = 1000000007;
ll gcd(ll a, ll b) {
  if (a < b) swap(a, b);
  if (a % b == 0)
    return b;
  else
    return gcd(b, a % b);
}
int main() {
  ll N, K, X;
  cin >> N >> K >> X;
  if (N + K == X || N + X == K || K + X == N)
    cout << "YES" << endl;
  else
    cout << "NO" << endl;
}
