#include <cstdio>
#include <cstring>
#include <iostream>
#include <string>
#include <cmath>
#include <bitset>
#include <vector>
#include <map>
#include <set>
#include <queue>
#include <deque>
#include <algorithm>
#include <complex>
#include <unordered_map>
#include <unordered_set>
#include <random>
#include <cassert>
using namespace std;
typedef long long int ll;
typedef pair<ll, ll> P;
ll gcd(ll a, ll b){
	if(b==0) return a;
	return gcd(b, a%b);
}
void extgcd(ll &a, ll &b, ll &c, ll &d){
    if(b==0) return;
    ll q=d/b;
    d-=q*b, c-=q*a;
    swap(a, c); swap(b, d);
    extgcd(a, b, c, d);
}
random_device rnd;
mt19937_64 mt(rnd());
uniform_int_distribution<ll> rndn(0, 1e9);
int main()
{
	ll a, b, c, d;
	cin>>a>>b>>c>>d;
    extgcd(a, b, c, d);
    if(a<0) a=-a;
    int n=a*d;
	cout<<n<<endl;
	int ct=0;
    while(ct<n){
        ll x=rndn(mt), y=rndn(mt);
        ct++;
        cout<<x<<" "<<y<<endl;
    }
	return 0;
}