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#include <bits/stdc++.h>

using namespace std;

const int N = 305;
bool sprawdz = true;


int check(string& a, string& b, int dl)
{
	
	if(a > b)
		return 0;
	
	if(a == b)
	{
		if(dl < a.size())
		{
			a.back() = '1';
			return 0;		
		}
		else
		{
			if(sprawdz)
				a += '0';
				
		 	return 1;	
		}
	}
	
	for(int i =0;i < dl; ++i)
		if(a[i] != b[i])
		{
			if(sprawdz)
				a += '0';
			return 1;		
		}
	int poz = -1;
	for(int i = dl; i < a.size(); ++i)
	{
		a[i] = b[i];
		if(a[i] != '9')
			poz = i;
	}
	if(poz == -1)
	{
		for(int i = dl; i < a.size(); ++i)
			a[i] = '0';
		a += '0';
		return 1;	
	}
	
	a[poz]++;
	for(int i = poz + 1; i < a.size(); ++i)
		a[i]= '0';
	return 0;		

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

	long long res = 0;
	int n;
	cin>>n;
	string last;
	cin>>last;
	int dl =last.size();
	for(int i= 1; i < n; ++i)
	{
		string cur;
		cin>>cur;
		
		int te = cur.size();
		if(cur.size() > last.size())
		{
			dl = cur.size();
			last = cur;
			continue;
		}
		cur.resize(last.size(), '0');
		
		int t = check(cur, last, te);	

		if(t == 1)
			++dl;

		res += dl -te;
		
	
		if(cur.size() > 30)
			sprawdz = 0;
			
		last = cur;
	}
	
	cout<<res;
}