n = input()
c = 0

for i in n:
    if i == "8":
        c += 2
    elif i == "0" or i == "4" or i == "6" or i == "9":
        c += 1

a1 = len(n) * 2 + 1 + c
a2 = len(n) + (c + 1) * 2

print(min(a1,a2))