#include <bits/stdc++.h>
using namespace std;
int main() {
  int a, b, c;
  cin >> a >> b >> c;
  int ans = (a + b + c) / 3;
  if ((ans == a || ans == b) || ans == c)
    cout << "Yes" << endl;
  else
    cout << "No" << endl;
}
