#include <bits/stdc++.h>
int main(void) {
  unsigned long a, b, c, i;
  scanf("%lu %lu %lu", &a, &b, &c);
  if (a < 1 || b < 1 || c < 1) {
    return 0;
  }
  i = 1;
  while (i * i < a * b) {
    i++;
  }
  if (i * i > a * b) {
    i = i - 1;
  }
  if (a + b + (2 * i) >= c) {
    printf("No");
  } else if (a + b + (2 * i) < c) {
    printf("Yes");
  }
  return 0;
}
