#include <bits/stdc++.h>
int main() {
  long long int a, b, c;
  scanf("%lld %lld %lld", &a, &b, &c);
  long long int haa = c - a - b;
  if (haa > 0 && 4 * a * b < haa * haa) {
    puts("Yes");
  } else {
    puts("No");
  }
}
