#include <bits/stdc++.h>
using Int = int64_t;
constexpr Int INF = INT_MAX;
constexpr Int mod = 1e9 + 7;
Int Sum(Int a, Int b) {
  if (b < a) return 0;
  if ((b - a + 1) % 2 == 0)
    return (a + b) * (b - a + 1) / 2;
  else
    return (a + b) * ((b - a + 1) / 2) + (a + b) / 2;
}
void calc() {
  Int a, b, c;
  std::cin >> a >> b >> c;
  if ((4 * a * b < pow(c - a - b, 2)) && (c - a - b > 0))
    std::cout << "Yes";
  else
    std::cout << "No";
}
int main() {
  calc();
  return 0;
}
