#include <bits/stdc++.h>
using namespace std;
using Graph = vector<vector<int>>;
template <class T>
inline bool chmax(T& a, T b) {
  if (a < b) {
    a = b;
    return true;
  }
  return false;
}
template <class T>
inline bool chmin(T& a, T b) {
  if (a > b) {
    a = b;
    return true;
  }
  return false;
}
const int INF = 1e9 + 7;
const long long LINF = 1LL << 60;
int main() {
  cin.tie(0);
  ios_base::sync_with_stdio(0);
  int a, b, c;
  cin >> a >> b >> c;
  if (c <= a * 2 + b * 2)
    cout << "Yes" << endl;
  else
    cout << "No" << endl;
  return 0;
}
