#include <bits/stdc++.h>
using namespace std;
const int MOD = 1000000007;
const int INF = 1e9;
const double EPS = 1e-9;
const double PI = acos(-1.0);
const int DX[4] = {1, 0, -1, 0};
const int DY[4] = {0, 1, 0, -1};
long long gcd(long long a, long long b) { return b ? gcd(b, a % b) : a; }
long long lcm(long long a, long long b) { return a / gcd(a, b) * b; }
long double a, b, c;
int main() {
  cin >> a >> b >> c;
  if (a + b < sqrtl(c)) {
    cout << "Yes" << endl;
  } else {
    cout << "No" << endl;
  }
  return 0;
}
