GenMat28

#include <iostream>
using namespace std;
int a[31][31];

int main()
{
    int n;
    cin>>n;
    for(int k=1;k<=n;++k)
        for(int i=1,j=k;i<=k&&j>=1;++i,--j)
        {
            if(i+j==k+1)
            {
                if(k%2)
                    a[i][j]=a[n-i+1][n-j+1]=(k+1)/2;
                else
                    a[i][j]=a[n-i+1][n-j+1]=(n-k/2+1);
            }
        }
    for(int i=1;i<=n;++i,cout<<'\n')
        for(int j=1;j<=n;++j)
            cout<<a[i][j]<<' ';
    return 0;
}