#!/usr/bin/env python3
import sys
sys.setrecursionlimit(2000)
mem = {0 : 0}
def solve(s):
    if s in mem: return mem[s]
    d = s%10
    a = 1e9
    if d <= 5: a = min(a, d + solve(s//10))
    if d >= 5: a = min(a, 10-d + solve(s//10 + 1))
    mem[s] = a
    return a

print(solve(int(input())))