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

rQ = Q[::-1]
ry = y[::-1]
x = int(x)
P = int(P)
ry = int(ry)
inv = pow(ry,P-2,P)
rQ = int(rQ)
u = inv * (x-rQ) % P
s = 1
now = 10
while 10 % P != u:
    s += 1
    u = u * 10 % P
ans = str(ry) + '0' * (s-len(Q)) + str(rQ)
print(ans)