#include <bits/stdc++.h>
using namespace std;
using ll = long long;
ll one_to_N (int N) {
  ll x = 0ll;
  for (int i = 0; i <= N; i++) x += i;
  return x;
}
int main() {
  int a, b, c;
  cin >> a >> b >> c;
  if (max(a, max(b, c)) < (a+b+c-max(a, max(b, c)))) cout << "Yes" << endl;
  else cout << "No" << endl;
}