#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using P = pair<int, int>;
using Graph = vector<vector<int>>;
template <class t, class u>
void chmax(t& a, u b) {
  if (a < b) a = b;
}
template <class t, class u>
void chmin(t& a, u b) {
  if (b < a) a = b;
}
const int INF = 1e9 + 5;
int main() {
  int a, b, c;
  cin >> a >> b >> c;
  if (a + b * 2 >= c)
    cout << "Yes" << endl;
  else
    cout << "No" << endl;
}
