P, Q, x, y = map(int, input().split())

while y % 10 == 0 or int(str(y)[::-1]) % P == 0:
    y += Q
n = str(y)[::-1]

r = int(n) % P
zero = 0
while r != x:
    r *= 10
    zero += 1
    r %= P
print(n + "0" * zero)