/*#include<stdio.h>
int main()
{
int arr [101] [101]={};
int i,j,n,a=1;
scanf("%d",&n);
for(i=1;i<=n;i++)
{
if(i%2==1)
{
for(j=1;j<=n;j++)
{
arr[i] [j] =a++;
}
}
else
{
for(j=n;j>=1;j--)
{
arr[i] [j] =a++;
}
}
}
for(i=1;i<=n;i++)
{
for(j=1;j<=n;j++)
{
printf("%d ",arr[i] [j]);
}
printf("\n");
}
}
/*
#include<stdio.h>
int main()
{
int arr[101] [101]={};
int n,i,j,a=1;
scanf("%d",&n);
for(i=1;i<=n;i++)
{
if(i%2==0)
{
for(j=1;j<=n;j++)
{
arr[i] [j] =a++;
}
}
else
{
for(j=n;j>=1;j--)
{
arr[i] [j] =a++;
}
}
}
for(i=1;i<=n;i++)
{
for(j=1;j<=n;j++)
{
printf("%d ",arr [i] [j]);
}
printf("\n");
}
}
*
#include<stdio.h>
int main()
{
int arr[101] [101]={};
int i,j,n,a=1;
scanf("%d",&n);
for(j=1;j<=n;j++)
{
if(j%2==0)
{
for(i=n;i>=1;i--)
{
arr [i] [j] =a++;
}
}
else
{
for(i=1;i<=n;i++)
{
arr [i] [j] =a++;
}
}
}
for(i=1;i<=n;i++)
{
for(j=1;j<=n;j++)
{
printf("%d ",arr[i] [j]);
}
printf("\n");
}
}
*
#include<stdio.h>
int main()
{
int arr[101] [101]={};
int n,i,j,a=1;
scanf("%d",&n);
for(j=1;j<=n;j++)
{
if(j%2==0)
{
for(i=1;i<=n;i++)
{
arr [i] [j] =a++;
}
}
else
{
for(i=n;i>=1;i--)
{
arr [i] [j] =a++;
}
}
}
for(i=1;i<=n;i++)
{
for(j=1;j<=n;j++)
{
printf("%d ",arr[i] [j]);
}
printf("\n");
}
}
*/