#include<bits/stdc++.h> using namespace std; int f(int k) { if(k==4) { cout<<"4,5-->9,10\n"; cout<<"8,9-->4,5\n"; cout<<"2,3-->8,9\n"; cout<<"7,8-->2,3\n"; cout<<"1,2-->7,8\n"; } else { cout<<k<<","<<k+1<<"-->"<<2*k+1<<","<<2*k+1<<endl; } } int main() { int n; cin>>n; f(n); return 0; }