#include<cstdio>
struct nod{
	int x,y;
}  
v[1005];
int n,i,j,k,m;

int euclid(int a,int b)
{
	int r=a%b;
	while (r) a=b,b=r,r=a%b;
	return b;
}

int main()
{
	freopen("fractii.in","r",stdin);
	freopen("fractii.out","w",stdout);
	scanf("%d",&n);
	for (i=1;i<=n-1;i++) v[i].x=i,v[i].y=2*n-1;
	for (i=n;i<=2*n-1;i++) k+=i;
	v[n].x=k;v[n].y=2*n-1;
	for (i=1;i<=n;i++) k=euclid(v[i].x,v[i].y),v[i].x=v[i].x/k,v[i].y=v[i].y/k;
	for (i=n;i>=1;i--) printf("%d %d\n",v[i].x,v[i].y);
	return 0;
}