#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;
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();
}