s = "0"+input()
n = len(s)
leq = INF = 1<<30
mor = 0
for i in map(int,s[::-1]):
    nleq = nmor = INF
    if i <=9: nmor = min(nmor, mor + i)
    if i > 0: nleq = min(nleq, mor + (10-i if i >= 5 else 1+5-i))
    if i >=5: nleq = min(nleq, mor + 1 + i-5)
    if i <=5: nmor = min(nmor, mor + 1 + (5-i))
    i += 1
    if i <=9: nmor = min(nmor, leq + i)
    if i > 0: nleq = min(nleq, leq + (10-i if i >= 5 else 1+5-i))
    if i >=5: nleq = min(nleq, leq + 1 + i-5)
    if i <=5: nmor = min(nmor, leq + 1 + (5-i))
    leq,mor = nleq,nmor
print(mor)