#include <bits/stdc++.h>
int main() {
  double a, b, c;
  scanf("%lf%lf%lf", &a, &b, &c);
  double y = a * b;
  double x = (c - a - b) * (c - a - b) / 4;
  if (c - a - b <= 0)
    printf("No");
  else {
    if (y < x)
      printf("Yes");
    else
      printf("No");
  }
}
