#include <bits/stdc++.h>
using namespace std;
const double PI = acos(-1);
const double EPS = 1e-7;
const int inf = 1e9;
int dx[] = {0, 1, 0, -1};
int dy[] = {1, 0, -1, 0};
int main() {
  int a, b, c;
  cin >> a >> b >> c;
  cout << (a + b * 2 >= c ? "Yes" : "No") << endl;
}
