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