def calc(x):
    return min(x, x // 5 + x % 5, 1 + (-x) % 5)

S = "0" + input()
N = len(S)
dp = [[0] * 2 for _ in range(N)]
for i in range(N):
    s = int(S[N - i - 1])
    if i == 0:
        dp[i][0] = calc(s)
        dp[i][1] = calc(10 - s)
    else:
        dp[i][0] = min(dp[i - 1][0] + calc(s), dp[i - 1][1] + calc(s + 1))
        dp[i][1] = min(dp[i - 1][0] + calc(10 - s), dp[i - 1][1] + calc(9 - s))

print(dp[-1][0])