import sys
input = lambda : sys.stdin.readline().rstrip()

write = lambda x: sys.stdout.write(x+"\n"); writef = lambda x: print("{:.12f}".format(x))
debug = lambda x: sys.stderr.write(x+"\n")
YES="Yes"; NO="No"; pans = lambda v: print(YES if v else NO)
LI = lambda : list(map(int, input().split()))
# sys.setrecursionlimit(3*10**5+10)

p,q,x,y = list(map(int, input().split()))
if y%10==0:
    y += q
v10 = [1]
index = {}
index[1] = 0
for i in range(p+10):
    v10.append(v10[-1]*10%p)
    index[v10[-1]] = i+1
n = int(str(y)[::-1])
val = (x*pow(n, p-2, p)) % p
i = index[val]
print(str(n) + "0" * i)