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#include <iostream>
#include <vector>
#include <queue>

using namespace std;

typedef long long ll;

void Wrzuc(deque<char>& D, string a)
{
    D.clear();
    for (int i = 0; i < a.size(); ++i)
        D.push_back(a[i]);
}

int Porownaj(string a, deque<char>& D)
{
    string t = "";
    for (int i = 0; i < a.size(); ++i)
    {
        t += D.front();
        D.pop_front();
    }
    for (int i = t.size() - 1; i >= 0; --i)
        D.push_front(t[i]);
    int wyn;
    if (a < t)
        wyn = -1;
    if (a == t)
        wyn = 0;
    if (a > t)
        wyn = 1;
    return wyn;
}

void WrzucDl(deque<char>& D, string a, int zera)
{
    if (D.size() <= 30)
    {
        string z(zera, '0');
        a = a + z;
        Wrzuc(D, a);
        return;
    }
    for (int i = 0; i < 20; ++i)
        D.pop_front();
    for (int i = 0; i < 10; ++i)
        D.pop_back();
    if ((int) D.size() <= zera)
    {
        int dod = zera - (int) D.size();
        for (int i = 0; i < dod; ++i)
            D.push_front('0');
    }
    else
    {
        int usu = (int) D.size() - zera;
        for (int i = 0; i < usu; ++i)
            D.pop_front();
    }
    for (int i = a.size() - 1; i >= 0; --i)
        D.push_front(a[i]);
}

int PierNiedz(deque<char>& D)
{
    int il = 0;
    while (D.size() != 0 && D.back() == '9')
    {
        D.pop_back();
        ++il;
    }
    int odp;
    if (D.size() == 0)
        odp = -1;
    else
        odp = D.size() - 1;
    for (int i = 0; i < il; ++i)
        D.push_back('9');
    return odp;
}

void Dodaj1(deque<char>& D, int niedz)
{
    int ildz = D.size() - niedz - 1;
    for (int i = 0; i < ildz; ++i)
        D.pop_back();
    ++(D.back());
    for (int i = 0; i < ildz; ++i)
        D.push_back('0');
}

int main()
{
    ios_base::sync_with_stdio(0);
    int n;
    cin >> n;
    vector<string> a(n);
    for (int i = 0; i < n; ++i)
        cin >> a[i];
    deque<char> D;
    Wrzuc(D, a[0]);
    ll odp = 0;
    for (int i = 1; i < n; ++i)
    {
        if (a[i].size() > D.size())
        {
            Wrzuc(D, a[i]);
            continue;
        }
        if (a[i].size() == D.size())
        {
            int por = Porownaj(a[i], D);
            Wrzuc(D, a[i]);
            if (por == -1 || por == 0)
            {
                D.push_back('0');
                ++odp;
            }
            continue;
        }
        if (a[i].size() < D.size())
        {
            int por = Porownaj(a[i], D);
            if (por == -1)
            {
                odp += (int) D.size() - (int) a[i].size() + 1;
                WrzucDl(D, a[i], (int) D.size() - (int) a[i].size() + 1);
            }
            if (por == 1)
            {
                odp += (int) D.size() - (int) a[i].size();
                WrzucDl(D, a[i], (int) D.size() - (int) a[i].size());
            }
            if (por == 0)
            {
                int niedz = PierNiedz(D);
                if (niedz < (int) a[i].size())
                {
                    odp += (int) D.size() - (int) a[i].size() + 1;
                    int dl = (int) D.size() - (int) a[i].size();
                    for (int j = 0; j < dl; ++j)
                        D.pop_back();
                    for (int j = 0; j < dl + 1; ++j)
                        D.push_back('0');
                }
                else
                {
                    odp += (int) D.size() - (int) a[i].size();
                    Dodaj1(D, niedz);
                }
            }
        }
    }
    cout << odp;
    return 0;
}