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#include <iostream>
#include <string>
#include <sstream>

using namespace std;

int last_not_nine(const string& s)
{
  int pos = s.length()-1;
  while ((pos > -1) and (s[pos] == '9'))
  {
    --pos;
  }
  return pos;
}

int main()
{
  int count;
  cin >> count;
  string actual;
  cin >> actual;
  int pos = last_not_nine(actual);
  long long counter = 0;
  for (unsigned i = 1; i < count; ++i)
  {
  	string next;
  	cin >> next;
  	int length = next.length();
  	if (length <= actual.length())
  	{
  	  int comp = next.compare(actual.substr(0, length));
	  if (comp < 0)
	  {
	  	next = next + string(actual.length() - length + 1, '0');
	  	pos = next.length() - 1;
	  }
	  else if (comp > 0)
	  {
	  	if (actual.length() > length)
		{
          next = next + string(actual.length() - length, '0');
	      pos = next.length() - 1;
	    }
	    else
	    {
	      pos = last_not_nine(next);	
		}
	  }
	  else
	  {
	    if (pos >= length)
	    {
	      next = next + actual.substr(length, pos - length + 1);
		  next[pos] = (actual[pos] + 1);
	      if (actual.length() > next.length())
	      {
	      	next = next + string(actual.length() - next.length(), '0');
	      	pos = next.length() - 1;
		  }
		  else
		  {
		    pos = last_not_nine(next);	
		  }
		}
		else
		{
		  next = next + string(actual.length() - length + 1, '0');
		  pos = next.length() - 1;
		}
	  }
	}
	else
	{
	  pos = last_not_nine(next);	
	}
	actual = next;
	counter += next.length() - length;
  }
  cout << counter;
  return 0;
}