def main():
    N = list(input())

    count = 0
    for n in N:
        if n in ("1","2","3","5","7"):
            count += 0
        elif n in ("0","4","6","9"):
            count += 1
        elif n == "8":
            count += 2

    count += min(1+2*len(N), len(N)+2)
    print(count)


if __name__ == "__main__":
    main()