#include <bits/stdc++.h>
using namespace std;
using P = pair<long long, long long>;
template <class T>
inline bool chmin(T& a, T b) {
  if (a > b) {
    a = b;
    return true;
  }
  return false;
}
template <class T>
inline bool chmax(T& a, T b) {
  if (a < b) {
    a = b;
    return true;
  }
  return false;
}
const long long MOD = 1000000007;
const int INF = 1 << 30;
int main() {
  int a, b, c;
  cin >> a >> b >> c;
  if (a + b * 2 >= c)
    cout << "Yes" << endl;
  else
    cout << "No" << endl;
}
