def main():
	how_many()

def how_many():
	x = input()
	x = x.split()
	a = int(x[0])
	b = int(x[1])
	c = int(x[2])
	d = int(x[3])
	if a == 0 or b == 0:
		if a != 0:
			nori = c // a
			print(nori)
		if b != 0:
			housa = d // b
			print(housa)
	else:
		nori = c // a
		housa = d // b
		print(min(nori, housa))

if __name__ == '__main__':
	main()