input_params = list(map(int,input().split()))
a = input_params[0]
b = input_params[1]
c = input_params[2]
d = input_params[3]

subres = [0]
for i in range(a):
    vnum = i + 1
    if c * vnum <= b and (c + 1) * vnum <= d:
        subres.append(vnum)
        
res = max(subres)
print(res)