using namespace std;
int main(){
	int a,b,c;
	cin>>a>>b>>c;
	if(a+b>3*c){
  		cout<<"YES";
  		return 0;
  	}
	if(a+c>3*b){
  	cout<<"YES";
  	return 0;
  	}
  	if(c+b>3*a){
  		cout<<"YES";
  		return 0;
  	}
  else{
  	cout<<"NO";
  }
  return 0;
}

using namespace std;
int main()
{
  int a,b,c;
  cin>>a>>b>>c;
  if(a+b>3*c or a+c>3*b or b+c>3*a){
  	cout<<"YES";
  }else{
  	cout<<"NO";
  }
  return 0;
}

没啥好说的