#!/usr/bin/env python3
import sys
sys.setrecursionlimit(1003)
def solve(s):
    if s == 0: return 0
    d = s%10
    if d <= 4: return d + solve(s//10)
    if d >= 6: return 10-d + solve(s//10 + 1)
    return min(d+solve(s//10), 10-d+solve(s//10+1))

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