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#include <iostream>
#include <string>
#include <map>
#include <vector>
using namespace std;

typedef unsigned long long ULL;

int main()
{
  ios_base::sync_with_stdio(false);

  int n;
  cin >> n;
  n--;

  string last, cur;
  cin >> last;

  ULL r = 0;
  while (n--)
  {
    cin >> cur;

    if (cur.size() == last.size())
    {
      bool changed = false;

      for (int i = 0; i < cur.size(); i++)
      {
        if (cur[i] > last[i])
        {
          changed = true;
          break;
        }
        else if (cur[i] < last[i])
        {
          cur += "0";
          r++;
          changed = true;
          break;
        }
      }

      if (!changed)
      {
        cur += "0";
        r++;
      }
    }
    else if (cur.size() < last.size())
    {
      bool bigger = false;
      bool smaller = false;

      for (int i = 0; i < cur.size(); i++)
      {
        if (cur[i] > last[i])
        {
          bigger = true;
          break;
        }
        else if (cur[i] < last[i])
        {
          smaller = true;
          break;
        }
      }

      int d = last.size() - cur.size();

      if (bigger || smaller)
      {
        while (d--)
        {
          cur += "0";
          r++;
        }
        if (smaller)
        {
          cur += "0";
          r++;
        }
      }
      else
      {
        bool all9 = true;

        for (int i = cur.size(); i < last.size(); i++)
        {
          if (last[i] != '9')
          {
            all9 = false;
          }
        }

        if (all9)
        {
          while (d--)
          {
            cur += "0";
            r++;
          }
          cur += "0";
          r++;
        }
        else
        {
          bool changed = false;
          string app = "";

          for (int i = last.size() - 1; i >= cur.size(); i--)
          {
            if (!changed && last[i] != '9')
            {
              changed = true;
              app = (char)(last[i] + 1) + app;
            }
            else
            {
              app = last[i] + app;
            }
          }

          cur += app;
          r += app.size();
        }
      }
    }

    last = cur;
  }

  cout << r << endl;

  return 0;
}