> #include<iostream>
> 
> using namespace std;
> 
> int main()
> {
> 	int n;
> 	while(1 == scanf("%d", &n) )
> 	{
> 		getchar();
> 		char ch[3002];
> 		if(n < 1)
> 		{
> 			gets(ch);
> 			puts("YES");
> 		}
> 		else if(n == 2)
> 		{
> 			int a, b, c;
> 			scanf("%d %d %d", &a, &b, &c);
> 			if(b * b >= 4 * a * c)
> 				puts("YES");
>             else
>                 puts("NO");
> 		}
> 		else
> 		{
> 			gets(ch);
> 			puts("NO");
> 		}
> 	}
> 	return 0;
> }1