N = input()

hole = 0
for i in range(len(N)):
    n = int(N[i])
    if n == 8:
        hole += 2
    elif n == 0 or n == 4 or n == 6 or n == 9:
        hole += 1

print(min(len(N)*2+hole+1, (hole+1)*2+len(N)))