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

** Command line arguments **
no arguments

** Generated test **
200000
77778 1
155555 2
33332 3
111109 4
188886 5
66663 6
144440 7
22217 8
99994 9
177771 10
55548 11
133325 12
11102 13
88879 14
166656 15
44433 16
122210 17
199987 18
77764 19
155541 20
33318 21
111095 22
188872 23
66649 24
144426 25
22203 26
99980 27
177757 28
55534 29
133311 30
11088 31
88865 32
166642 33
44419 34
122196 35
199973 36
77750 37
155527 38
33304 39
111081 40
188858 41
66635 42
144412 43
22189 44
99966 45
177743 46
55520 47
133297 48
11074 49...

** 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;
    rep(i,n){
        cout<<((i+1)*77777)%n+1<<" "<<i+1<<endl;
    }
    return  0;
}

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