#include <iostream>

using namespace std;

int main()
{
/* int n=7,a[n]={1,2,3,4,3,2,1};
 int c=1;
 for(int i=0;i<n/2;i++){
     if (a[i]==a[n-i-1]){
         c=1;
     }
     else{
         c=0;
     }
 }
 if(c==1){
     cout<<"good";
 }
 else{
     cout<<"bad";
 }
*/
 int n;
 int ch1=0,ch2=0;
 cout<<"1\n";
 cin>>n;
 cout<<"2"<<endl;
 int a[n];
 for(int b=0;b<n;b++){
     a[b]=0;
 }
 if(n%2==0){
     for (int i=0;i<n/2;i++){
         ch1+=1;
         a[i]=ch1;

         a[n-i-1]=a[i];
         cout<<a[i]<<"   "<<a[n-i-1]<<endl;
     }
 }
 if (n%2==1){
     for (int j=0;j<n/2+1;j++){
         ch2+=1;
         a[j]=ch2;
         a[n-j-1]=a[j];
     }
 }
 for (int i=0;i<n;i++){
     cout<<a[i];
 }

}