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