#include<iostream>
using namespace std;
void main()
{
int i,j,n;
cout<<"输入一个数:"<<endl;
cin>>n;
for(i=1;i<=n;i++)
{
for(j=1;j<=2*n-1;j++)
{
if(i+j==n+1||j-i==n-1||i==n)
cout<<"*";
else
cout<<" ";
}
cout<<endl;
}
}