#include<iostream.h>
#include<fstream.h>
ifstream f("tije.in");
ofstream g("tije.out");
int main()
{unsigned i,n,j;
f>>n;
for(i=1;i<=n;i++)
for(j=1;j<=n;j++)
g<<i<<" "<<n+1<<endl;
for(i=1;i<=n;i++)
for(j=1;j<=n;j++)
g<<n+1<<" "<<j<<endl;
g.close();
f.close();
return 0;
}