#include <bits/stdc++.h>
#pragma GCC optimize("Ofast")
#define _GLIBCXX_DEBUG
using namespace std;
using std::cout;
using std::cin;
using std::endl;
using ll=long long;
using ld=long double;
ll ILL=1167167167167167167;
const int INF=2100000000;
const ll mod=998244353;
#define rep(i,a) for (ll i=0;i<a;i++)
template<class T> using _pq = priority_queue<T, vector<T>, greater<T>>;
template<class T> ll LB(vector<T> &v,T a){return lower_bound(v.begin(),v.end(),a)-v.begin();}
template<class T> ll UB(vector<T> &v,T a){return upper_bound(v.begin(),v.end(),a)-v.begin();}
template<class T> bool chmin(T &a,const T &b){if(a>b){a=b;return 1;}else return 0;}
template<class T> bool chmax(T &a,const T &b){if(a<b){a=b;return 1;}else return 0;}
template<class T> void So(vector<T> &v) {sort(v.begin(),v.end());}
template<class T> void Sore(vector<T> &v) {sort(v.begin(),v.end(),[](T x,T y){return x>y;});}
void yneos(bool a){if(a) cout<<"Yes\n"; else cout<<"No\n";}

ll rev(ll N){
	ll ans=0;
	while(N){
		ans*=10ll;
		ans+=N%10;
		N/=10;
	}
	return ans;
}

void solve();


//  rainy ~ 雨に打たれて ~
int main() {
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	
	int t=1;
	//cin>>t;
	rep(i,t) solve();
}

void solve(){
	ll P,Q,x,y;
	cin>>P>>Q>>x>>y;
	ll tmp=y;
	while(true){
		if(tmp%10!=0&&rev(tmp)%P!=0){
			break;
		}
		tmp+=Q;
	}
	tmp=rev(tmp);
	ll base=tmp;
	int c;
	cout<<tmp;
	rep(i,P){
		if(base%P==x){
			c=i;
			break;
		}
		base*=10ll;
		base%=P;
		cout<<"0";
	}
	cout<<"\n";
}