#include <bits/stdc++.h>
using namespace std;

int main() {
  
  int A, B, C;
  
  cin >> "A" >> "B" >> "C";
  
  if (2*A + 2*B >= C){
    cout << "Yes" << endl;
  }else if(2*A + 2*B < C){
    cout << "No" << endl;
  }
}  