int main()
{
    int n = 0;
   
    while (~scanf(" %d", &n))
    {
        int i,j;
        for (i = 0; i <n; i++) {       //行
            for (j = 0; j < n; j++) {	//列
                
                if (j>0&&j<n-1&&i>0&&i<n-1)	//确定空格范围
                    printf("  ");
                else
                    printf("* ");
                    
            }
            printf("\n");
        }   
    }
    return 0;
}