num_apple = 5
num_carrot = 1
k = 2
answer = 0

if num_apple < (3 * num_carrot):
		answer = num_apple // 3
else:
		answer = num_carrot

num_apple -= answer * 3
num_carrot -= answer

i = 0
k = k - (num_apple + num_carrot)

while k > 0:
	if i % 4 == 0:
			answer = answer - 1
        
i = i + 1
k = k - 1

print(answer)