include

include

include

include

int main() { int n,i; scanf("%d", &n); int size = 2*n-1; int a[size][size];

int top = 0;
int bottom=size-1;
int left=0;
int right=size-1;

while(top<=bottom && left<=right)
{
    for(i=left;i<=right;i++)
    {
        a[top][i]=n;
    }
    top++;
    for(i=top;i<=bottom;i++)
    {
        a[i][right]=n;
    }
    right--;
    for(i=right;i>=left;i--)
    {
        a[bottom][i]=n;
    }
    bottom--;
    for(i=bottom;i>=top;i--)
    {
        a[i][left]=n;
    }
    left++;

    n--;
}


for(i=0;i<size;i++)
{
    for(int j=0;j<size;j++)
    {
        printf("%d ",a[i][j]);
    }
    printf("\n");
}

}