#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <algorithm>
#include <vector>
#include <string>
#include <set>
#include <map>
#include <cmath>
#include <memory.h>
#include <ext/rope>
using namespace std;
using namespace __gnu_cxx;
typedef long long ll;

const int N = 1e6+6;


int main(){
   // freopen("input.txt","r",stdin);// freopen("output.txt","w",stdout);

    int n = 1<<20;

    rope<int> v;

    for(int i=0;i<n;++i) v.push_back(i);// else v.push_front(i);

    for(int i=0;i<11;++i) v.insert(0,v);
    cout<<v.size()<<endl;

    for(int i=0;(1<<i)+i<v.size();++i) cout<<i<<": "<<v[(1<<i)+i]<<endl;

    return 0;
}