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#include <bits/stdc++.h>

using namespace std;

#define st first
#define nd second
#define pb push_back
#define sz(x) (int)(x).size()
#define ll long long
ll mod=1000000007;
int inf=1000000007;
ll infl=1000000000000000007;

pair<int,int> ans[107];

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int k;
    cin>>k;
    for(int i=1;i<60;i++)
    {
        if(i%2==1) ans[i]={i+1,i+2};
        else ans[i]={i+1,-1};
    }
    ans[60]={-1,-1};
    ans[61]={-1,-1};
    ans[62]={-1,-1};
    int i=2;
    while(k>0)
    {
        if((k&1)) ans[i].nd=62;
        k/=2;
        i+=2;
    }
    cout<<62<<endl;
    for(int i=1;i<=62;i++) cout<<ans[i].st<<" "<<ans[i].nd<<endl;

    return 0;
}