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