> #include <stdio.h>
> void main()
> {
> 	unsigned long a,i;
> 	scanf("%ld",&a);
> 	for(i=a;;i--)if((a*a+1)%i==0)break;
> 	printf("%ld\n",2*a+(a*a+1)/i+i);
> }
果然牛X，小弟佩服！