#include <bits/stdc++.h>
using ll = long long;
using ld = long double;
template <class T, class S>
void cmin(T &a, const S &b) {
  if (a > b) a = b;
}
template <class T, class S>
void cmax(T &a, const S &b) {
  if (a < b) a = b;
}
using namespace std;
signed main() {
  int a, b, c, d;
  cin >> a >> b >> c;
  cout << (a * 2 + b * 2 >= c ? "Yes" : "No") << endl;
}
