S = input()
A = 0
B = 0
mode = 0
for i in range(len(S)):
	if S[i] == "/":
		mode += 1 
		continue
	else:
		if mode == 0:
			A *= 10
			A += int(S[i])
		else:
			B *= 10
			B += int(S[i])
print(A/B)