#include <bits/stdc++.h>
using namespace std;

using ll = long long;
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    string s;
    cin >> s;
    ll ans = 0, up = 0;
    reverse(s.begin(), s.end());
    s += '0';
    for (int i = 0; i < s.length() - 1; i++)
    {
        if (s[i] - '0' + up < 5)
        {
            ans += s[i] - '0' + up;
            up = 0;
        }
        else if (s[i] - '0' + up == 5)
        {
            if (s[i + 1] > '5')
            {
                ans += 10 - s[i] + '0' - up;
                up = 1;
            }
            else
            {
                ans += s[i] - '0' + up;
                up = 0;
            }
        }
        else
        {
            ans += 10 - s[i] + '0' - up;
            up = 1;
        }
    }
    ans += up;
    cout << ans << "\n";
}