#include <iostream>

using namespace std;

int main()
{
int i,j,s,n;
cin>>n;
s=0;
for (i=1;i<=n-1;i++)
{ for (j=i+1;j<=n; j++)
{ cout <<i<<„,“<< j<<“ „;
cout<<“ „;
s=s+1; }
cout << endl; }

cout<<„bice“<<“ „<<s<<“ utakmica“<<endl;
return 0;
}