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#include <iostream>

using namespace std;

int main()
{
    int n;
    cin>>n;
    cout<<92 <<endl;
    for(int i = 1 ; i < 91 ; i ++)
    {
        if(i%3==1)
            cout<<i+1<<" "<<i+2<<"\n";
        else if(i%3==2)
            cout<<i+2<<" -1\n";
        else
        {
            cout<<i+1<<" ";
            if(n%2==1)cout<<92<<"\n";
            else cout<<-1<<"\n";
            n/=2;
        }
        
    }
    cout<<"-1 -1\n-1 -1\n";
}