mod = 1000000007
eps = 10**-9


def main():
    import sys
    input = sys.stdin.readline

    P, Q, x, y = map(int, input().split())
    if y % 10 == 0:
        y += Q
    N = str(y)[::-1]
    m = int(N) % P
    if m != 0:
        while True:
            y += Q
            if y % 10 == 0:
                continue
            N = str(y)[::-1]
            m = int(N) % P
            if m:
                break

    cnt = 0
    while m != x:
        cnt += 1
        m = (m * 10)%P
    print(N + "0" * cnt)


if __name__ == '__main__':
    main()