*******************************
*** The hack uses generator ***
*******************************

** Command line arguments **
no arguments

** Generated test **


** Generator source **
#ifdef LOCAL
//#define _GLIBCXX_DEBUG
#endif
//#pragma GCC target("avx512f,avx512dq,avx512cd,avx512bw,avx512vl")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

#define endl '\n'
#define REP(i, a, b) for(ll i=(a); i<(b); i++)
#define PER(i, a, b) for(ll i=(a); i>=(b); i--)
#define rep(i, n) REP(i, 0, n)

int solve(){
    ll n = 2e5;
    cout<<n<<endl;
    auto rand = [](ll n)->ll{
        random_device rd;
        mt19937 mt(rd());
        return mt()%n;
    };
    rep(i,n){
        cout<<(i+1)<<" "<<rand(20)+1<<endl;
    }
    return  0;
}

int main() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    cout<<std::setprecision(10);
    solve();
}