#include <bits/stdc++.h>
using namespace std;
using ll = long long;
const int INF = 1001001001;
const ll INF_LL = 1001001001001001001LL;
int main(void) {
  int a, b, c;
  cin >> a >> b >> c;
  bool ok = false;
  if (2 * a + 2 * b >= c) ok = true;
  if (ok)
    cout << "Yes" << endl;
  else
    cout << "No" << endl;
  return 0;
}
