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#include <bits/stdc++.h>

using namespace std;

bool operator<(const string& a, const string& b)
{
	for(int i = 0; i < min(a.size(), b.size()); i++)
	{
		if(a[i] < b[i])
			return true;
		else if(a[i] > b[i])
			return false;
	}
	return false;
}

bool operator>(const string& a, const string& b)
{
	for(int i = 0; i < min(a.size(), b.size()); i++)
	{
		if(a[i] > b[i])
			return true;
		else if(a[i] < b[i])
			return false;
	}
	return false;
}

string increment(const string& s)
{
	string t = s;
	for(int i = s.size() - 1; i >= 0; i++)
	{
		if(t[i] == '9')
			t[i] = '0';
		else
		{
			++t[i];
			return t;
		}
		if(!i)
			t = "1" + t;
	}
	return t;
}

int main()
{
	ios_base::sync_with_stdio(false);
	cin.tie(NULL); cout.tie(NULL);
	int x; cin >> x;
	string prev, next;
	cin >> prev;
	long long sum = 0;
	for(int i = 1; i < x; i++)
	{
		cin >> next;
		int diff = prev.size() - next.size();
		sum += max(diff, 0);
		if(diff > 0 || (!diff && prev >= next))
		{
			if(next > prev)
			{
				while(prev.size() > next.size())
					next += "0";
			}
			else if(next < prev)
			{
				++sum;
				while(prev.size() >= next.size())
					next += "0";
			}
			else
			{
				string temp = increment(prev);
				if(temp > next)
				{
					++sum;
					while(prev.size() >= next.size())
						next += "0";
				}
				else
				{
					next = temp;
				}
			}
		}
		prev = next;
	}
	cout << sum << endl;
}