#include <iostream>
#include <stdio.h>
#include <vector>

using namespace std;

int k,p;
int arr[100];
vector <bool> v;

int main()
{
    scanf("%d",&k);

    while(k){
        v.push_back(k&1);
        k>>=1;
    }

    p=100;
    for(int i=v.size()-2;i>=0;i--){
        arr[p-2]=p;
        p-=2;
        if(v[i]) arr[p-1]=100;
        p--;
    }

    printf("100\n");
    for(int i=1;i<100;i++){
        if(arr[i]) printf("%d %d\n",i+1,arr[i]);
        else printf("%d -1\n",i+1,arr[i]);
    }
    printf("-1 -1\n");

    return 0;
}