#include <bits/stdc++.h>
using namespace std;
const long long mod = 1000000007;
const vector<int> di = {-1, 0, 1, 0};
const vector<int> dj = {0, 1, 0, -1};
int main() {
  long double a, b, c;
  cin >> a >> b >> c;
  long double ab = sqrtl(a * b);
  long double ans = c - (a + b) - 2 * ab;
  if (ans > 0) {
    cout << "Yes" << endl;
  } else {
    cout << "No" << endl;
  }
  return 0;
}
