#pragma GCC optimize("Ofast", "unroll-loops", "omit-frame-pointer","inline")
#pragma GCC option("arch=native","tune=native","no-zero-upper")
#include <bits/stdc++.h>

using namespace std;

using ll = long long;
using ld = long double;

#define X first
#define Y second


const ll mod = 1000000007;
//const ll mod = 998244353;



ll pew(ll a, ll b) {
    ll res = 1;
    while (b>0) {
        if (b&1) res = res*a%mod;
        b >>= 1;
        a = a*a%mod;
    }
    return res;
}



void solve() {
    string s;
    cin >> s;
    ll A = 0, A2 = 1;
    for (ll i=0;i<s.length();i++) {
        ll d = s[i]-'0';
        ll B = A+d, B2 = A+d+1;
        B = min(B,A2+10-d);
        B2 = min(B2,A2+9-d);
        A = B, A2 = B2;
    }
    cout << A << "\n";
}

int main() {
    ios_base::sync_with_stdio(false);
    int T = 1;
    //cin >> T;
    while (T--) solve();
    return 0;
}