A = int(input())
B = int(input())
C = int(input())
D = int(input())

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))