using System;
using System.Collections.Generic;
using System.Linq;

namespace AtCoder
{
    class Program
    {
        static void Main(string[] args)
        {
            input_iter = LazyLoadAllLines();
            //------------------------------------------------//
            //var n = Read<long>();
            //var s = Read();
            //var als = Read<long>(n);
            //var sls = Read(n);
            /*List<Tuple<string, long>> scls = new List<Tuple<string, long>>();
            for (int i = 0; i < m; ++i)
            {
                scls.Add(new Tuple(Read(), Read<long>()));
            }*/
            //List<List<long>> abls = new List<List<long>>();
            //List<long> cls = new List<long>();
            /*List<long> edgeNum = Enumerable.Repeat(0L, (int)n).ToList();
            for (int i = 0; i < n - 1; ++i)
            {
                abls.Add(Read<long>(2));
                abls[i].Add(i);
                abls[i].Add(-1);
                --abls[i][0];
                --abls[i][1];
                //cls.Add(Read<long>());
                ++edgeNum[(int)abls[i][0]];
                ++edgeNum[(int)abls[i][1]];
            }*/

            //als.Sort((l, r) => (int)(r - l));

            var n = Read();
            var revN = n.Reverse().Select(val => int.Parse(val.ToString())).ToList();

            var dp = new int[2,n.Length];
            dp[0, 0] = revN[0];
            dp[1, 0] = 10 - revN[0];
            for (int i = 1; i < n.Length; ++i)
            {
                dp[0, i] = Math.Min(dp[0, i - 1] + revN[i], dp[1, i - 1] + (revN[i] + 1));
                dp[1, i] = Math.Min(dp[0, i - 1] + (10 - revN[i]),
                    dp[1, i - 1] + (10 - (revN[i] + 1)));
            }

            Console.WriteLine(Math.Min(dp[0, n.Length - 1], dp[1, n.Length - 1] + 1));

            /*var cnt = 0L;
            int i = 0;
            for(; i < n.Length - 1; ++i)
            {
                if(revN[i] == 10)
                {
                    ++revN[i + 1];
                    revN[i] = 0;
                }
            
                if (revN[i] > 5)
                {
                    //繰り上げ
                    ++revN[i + 1];
                    cnt += (10 - revN[i]);
                }
                else
                {
                    //支払い
                    cnt += revN[i];
                }
            }

            if (revN[i] == 10)
            {
                ++cnt;
                revN[i] = 0;
            }

            if (revN[i] > 5)
            {
                //繰り上げ
                cnt += (10 - revN[i] + 1);
            }
            else
            {
                //支払い
                cnt += revN[i];
            }*/

            //Console.WriteLine(cnt);


            /*var n = Read<long>();
            var sls = Read(n);

            Dictionary<string, int> cnt = new Dictionary<string, int>();
            int val;
            int cntMax = 1;
            foreach(var s in sls)
            {
                if(cnt.TryGetValue(s, out val))
                {
                    ++cnt[s];
                    if (cntMax < val + 1) cntMax = val + 1;
                }
                else
                {
                    cnt[s] = 1;
                }
            }

            List<string> cntDict = cnt.Where(kv => kv.Value == cntMax).Select(kv => kv.Key).ToList();
            cntDict.Sort();

            foreach (var x in cntDict) Console.WriteLine(x);*/
        }

        static IEnumerator<string> input_iter;

        static IEnumerator<string> LazyLoadAllLines(bool doSplit = true)
        {
            string line;
            if (doSplit)
            {
                do
                {
                    line = Console.ReadLine();
                    foreach (var s in line.Split(' '))
                        yield return s;
                } while (line != null);
            }
            else
            {
                do
                {
                    line = Console.ReadLine();
                    yield return line;
                } while (line != null);
            }
        }
        static _T Read<_T>() where _T : struct
        {
            input_iter.MoveNext();
            return (_T)Convert.ChangeType(input_iter.Current, typeof(_T));
        }
        static string Read()
        {
            input_iter.MoveNext();
            return input_iter.Current;
        }
        static List<_T> Read<_T>(long num) where _T : struct
        {
            List<_T> res = new List<_T>();
            for (long i = 0; i < num; ++i)
            {
                input_iter.MoveNext();
                res.Add((_T)Convert.ChangeType(input_iter.Current, typeof(_T)));
            }
            return res;
        }
        static List<string> Read(long num)
        {
            List<string> res = new List<string>();
            for (long i = 0; i < num; ++i)
            {
                input_iter.MoveNext();
                res.Add(input_iter.Current);
            }
            return res;
        }

    }
}


Measured memory_bytes: 32936