#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using P = pair<int, int>;
const int INF = 1001001001;
const vector<int> di = {-1, 0, 1, 0};
const vector<int> dj = {0, -1, 0, 1};
void chmin(int &a, int b) {
  if (a > b) a = b;
}
ll GCD(ll a, ll b) {
  if (b == 0)
    return a;
  else
    return GCD(b, a % b);
}
ll LCM(ll a, ll b) {
  ll g = GCD(a, b);
  return a / g * b;
}
int main() {
  ll a, b, c;
  cin >> a >> b >> c;
  ll d = abs(c - a - b);
  if (a > b) swap(a, b);
  cout << (((4 * a) < (d * d / b)) ? "Yes" : "No") << endl;
}
