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

int n;
long long wynik;
string s1 = "", s2 = "";

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    cin >> n;

    for (int i = 0, a; i < n; i++, s1.swap(s2))
    {
        cin >> a;
        s2 = to_string(a);

        if (s1.size() > s2.size())
        {
            bool p1 = false, p2 = false;
            for (int j = 0; j < s2.size(); j++)
            {
                if (s1[j] < s2[j])
                {
                    p1 = true;
                    break;
                }
                if (s1[j] > s2[j])
                {
                    p2 = true;
                    break;
                }
            }
            if (p1 || p2)
            {
                wynik += s1.size() - s2.size();
                for (int i = s1.size(); i < s2.size(); i++)
                    s2.append("0");
            }
            if (p2)
            {
                s2.append("0");
                wynik++;
            }
            if (!p1 && !p2)
            {
                bool p3 = false;
                for (int j = s1.size() - 1; j >= s2.size(); j--)
                {
                    if (s1[j] == '9')
                        s1[j] == '0';
                    else
                    {
                        s1[j]++;
                        p3 = true;
                        break;
                    }
                }
                wynik += s1.size() - s2.size();
                s2.append(s1.begin() + s2.size(), s1.end());
                if (!p3)
                {
                    s2.append("0");
                    wynik++;
                }
            }
        }
        else if (s1.size() == s2.size())
        {
            bool p = false;
            for (int j = 0; j < s1.size(); j++)
            {
                if (s1[j] > s2[j])
                    break;
                if (s1[j] < s2[j])
                {
                    p = true;
                    break;
                }
            }
            if (!p)
            {
                s2.append("0");
                wynik++;
            }
        }
    }

    cout << wynik << '\n';
}