#include <bits/stdc++.h>
using namespace std;
vector<long long int> vec;
vector<vector<long long int> > vec2;
long long int MOD = 1000000007;
long long int INF = 1145141919454519;
int main() {
  long long int A, B, C;
  cin >> A >> B >> C;
  if ((A + B * 2) - C >= 0) {
    cout << "Yes" << endl;
  } else {
    cout << "No" << endl;
  }
}
