TESTING = False
inp = '9084194700940903797191718247801197019268'


def once(values, turnlist):
    values = list(values)
    for ai in reversed(range(len(values))):
        bi = len(values) - ai - 1

        diff = (values[bi] - values[ai]) % 10

        if diff < 5:
            turnlist[ai] += diff
            values[ai] += diff

        if values[ai] > 9:
            if ai > 0:
                values[ai - 1] += values[ai] // 10
            values[ai] = values[ai] % 10

    return values


def is_pal(s):
    return s == s[::-1]


def get(values):
    values = list(map(int, values))

    turns = [0] * len(values)

    while True:
        new = once(values, turns)

        if new == values:
            break

        values = new

    if TESTING:
        print('-----', *values)

    for ai in reversed(range(len(values))):
        bi = len(values) - ai - 1

        if ai == bi:
            pass
        else:
            av = int(values[ai])
            bv = int(values[bi])

            diff = bv - av

            if diff == 5:
                if bi > 0 and turns[bi - 1] > 0:
                    turns[bi] += 5
                    turns[bi - 1] -= 1
                    values[bi] = (values[bi] + 5) % 10
                else:
                    turns[ai] += 5
                    values[ai] += 5

    return turns, values


if not TESTING:
    inp = input()
else:
    print('input', *inp)

turns, res = get(inp)

if TESTING:
    print()
    print('reslt', *res)
    print('rturn', *res[::-1])
    print(is_pal(res))
    print()
    print('turns', *turns)

print(sum(turns))