#include <bits/stdc++.h>
using namespace std;
template <class T>
ostream &operator<<(ostream &out, vector<T> const &v) {
  for (auto &&a : v) out << a << " ";
  out << endl;
  return out;
}
template <class T>
void dump(T &a) {
  cout << a << endl;
}
void solve();
int main() {
  solve();
  return 0;
}
void solve() {
  int a, b, c;
  cin >> a >> b >> c;
  if (a * 2 + b * 2 >= c)
    cout << "Yes" << endl;
  else
    cout << "No" << endl;
}
