import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines

A,B,C,D = map(int,read().split())

def test(x):
    if x > A:
        return False
    y = C * x
    if y > B:
        return False
    if x + y > D:
        return False
    return True

answer = 0
for i in range(110):
    if test(i):
        answer = i

print(answer)