p,q,x,y = map(int,input().split())

now = y
while True:
    cand = int(str(now)[::-1])
    if cand%p:
        break
    now += q

for i in range(p):
    if pow(10,i,p) == cand%p:
        k = i
        break

for i in range(k,k+p):
    if pow(10,i,p) == x:
        l = i
        break

print(pow(10,l-k)*cand)