#include <bits/stdc++.h>
using namespace std;
using ll = long long;
ll isqrt(ll x) {
    ll ret = sqrt(x);
    ret = max(0ll, ret - 10);
    while (ret * ret <= x) {
        ret ++;
    }
    ret --;
    return ret;
}
int main () {
    int N = 1000000;
    ll X = (ll)1e9;
    cout << N << endl;
    for (ll i = 0; i < N - 1; i ++) {
        cout << X - i << " " << isqrt(X * X - (X - i) * (X - i)) << endl;
    }
    cout << "0 0" << endl;
}