#define _USE_MATH_DEFINES
#include <bits/stdc++.h>
using namespace std;
#define FOR(i,m,n) for(int i=(m);i<(n);++i)
#define REP(i,n) FOR(i,0,n)
#define ALL(v) (v).begin(),(v).end()
using ll = long long;
constexpr int INF = 0x3f3f3f3f;
constexpr long long LINF = 0x3f3f3f3f3f3f3f3fLL;
constexpr double EPS = 1e-8;
constexpr int MOD = 1000000007;
// constexpr int MOD = 998244353;
constexpr int DY[]{1, 0, -1, 0}, DX[]{0, -1, 0, 1};
constexpr int DY8[]{1, 1, 0, -1, -1, -1, 0, 1}, DX8[]{0, -1, -1, -1, 0, 1, 1, 1};
template <typename T, typename U> inline bool chmax(T& a, U b) { return a < b ? (a = b, true) : false; }
template <typename T, typename U> inline bool chmin(T& a, U b) { return a > b ? (a = b, true) : false; }
struct IOSetup {
  IOSetup() {
    std::cin.tie(nullptr);
    std::ios_base::sync_with_stdio(false);
    std::cout << fixed << setprecision(20);
  }
} iosetup;

int main() {
  int p, x; ll q, y; cin >> p >> q >> x >> y;
  vector<int> p10(p, -1);
  for (int i = 0, mul = 1; i < p - 1; ++i) {
    p10[mul] = i;
    mul = mul * 10 % p;
  }
  ll m = y;
  while (true) {
    string m_str = to_string(m);
    reverse(ALL(m_str));
    if (m_str.front() != '0' && stoll(m_str) % p > 0) break;
    m += q;
  }
  string m_str = to_string(m);
  reverse(ALL(m_str));
  m = stoll(m_str);
  const int k = p10[m % p];
  int l = p10[x];
  if (l < k) l += p - 1;
  cout << m_str;
  REP(_, l - k) cout << '0';
  cout << '\n';
  return 0;
}