#include <bits/stdc++.h>
using namespace std;
const int inf = 1e9 + 7;
const long long infll = 1ll << 60ll;
const long long mod = 1e9 + 7;
constexpr int dx[] = {1, 0, -1, 0, 1, 1, -1, -1};
constexpr int dy[] = {0, -1, 0, 1, 1, -1, -1, 1};
int main() {
  cin.tie(0);
  ios::sync_with_stdio(false);
  int a, b, c;
  cin >> a >> b >> c;
  if (a + 2 * b >= c)
    cout << "Yes" << endl;
  else
    cout << "No" << endl;
  return 0;
}
