#include <bits/stdc++.h>
using namespace std;
using Graph = vector<vector<int>>;
int main() {
  int a, b, c;
  cin >> a >> b >> c;
  int s = a + b + c;
  int mx = max({a, b, c});
  if (s - mx >= mx)
    cout << "Yes" << endl;
  else
    cout << "No" << endl;
  return 0;
}
