T = list(map(int, input().split()))

A = T[0]
B = T[1]
C = T[2]
D = T[3]

if A == 0:
    ans = (D - (D % B))/B
    print(int(ans))
elif B == 0:
    ans = (C - (C % A))/A
    print(int(ans))
else:
    ans = min((D - (D % B))/B, (C - (C % A))/A)
    print(int(ans))