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#include <bits/stdc++.h>

#define F first
#define S second
#define ll long long
#define ld long double
#define vi vector < int >
#define vll vector < ll >
#define pb push_back
#define sz(x) int((x).size())
#define pii pair < int, int >
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define vpii vector < pii >
#define sqr(x) ((x)*(x))
#define fenwick(x) ((x) & -(x))
#define debug(x) cout << "[ " << #x << " ]: " << x << "\n";

using namespace std;

//CZY DANE POSORTOWANE, N = 0, N = 1, CZYTANIE TRESCI, < rosnaco, > malejaco

const int MAX = 2e5 + 12;
const ll MOD = 1e10;
const ll EEE = 1e16;

ll tab[MAX];
int oryg[MAX];
ll dodane[MAX];

int log10(ll a)
{
	int w = 0;
	while (a)
	{
		++w; a /= 10;
	}
	return w;
}

ll ppow(int ile)
{
	if (ile == 0)return 1;
	if (ile == 1)return 10;
	if (ile == 2)return 100;
	if (ile == 3)return 1000;
	if (ile == 4)return 10000;
	if (ile == 5)return 100000;
	if (ile == 6)return 1000000;
	if (ile == 7)return 10000000;
	if (ile == 8)return 100000000;
	if (ile == 9)return 1000000000;
	if (ile == 10)return 10000000000;
	if (ile == 11)return 1e11;
	if (ile == 12)return 1e12;
	if (ile == 13)return 1e13;
	if (ile == 14)return 1e14;
	if (ile == 15)return 1e15;
	if (ile == 16)return 1e16;
}


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

	int N;

	ll ans = 0;
	int czy_dodalem = 0;

	cin >> N;

	for (int i = 0; i < N; ++i)
	{
		cin >> tab[i];
		oryg[i] = log10(tab[i]);
	}

	int curr = 0;

	for (int i = 1; i < N; ++i)
	{
		vi taba, tabb;
		ll aa = tab[curr], bb = tab[i];

		if (aa < bb)
		{
			curr = i;
			continue;
		}
		
		ll cpbb = bb;
		while (aa){	taba.pb(aa % 10); aa /= 10;}
		while (cpbb){tabb.pb(cpbb % 10);cpbb /= 10;	}

		reverse(all(tabb));
		reverse(all(taba));

		while (sz(tabb) != sz(taba))
		{
			tabb.pb(0);
			bb *= 10;
			++dodane[i];
		}
		//cout << dodane[curr] << "+\t" << oryg[curr] << "-\t" << log10(aa) << "-\t" << oryg[i] << "\n";
		//cout << dodane[curr] + oryg[curr] - log10(aa) - oryg[i] << "PE\n";
		dodane[i] += dodane[curr] + oryg[curr] - log10(tab[curr]);
		bool czy = 0;
		for (int x = 0; x < oryg[i]; ++x)
		{
			if (taba[x] > tabb[x])
			{
				czy = 1;
				bb *= 10;
				while (bb >= 1e16)bb /= 10;
				curr = i;
				tab[i] = bb;
				dodane[i]++;
				break;
			}
			if (taba[x] < tabb[x])
			{
				czy = 1;
				bb %= EEE;
				curr = i;
				tab[i] = bb;
				break;
			}
		}

		if (czy)continue;

		int czy2 = 1;

		for (int x = sz(taba) - 1; x >= oryg[i]; --x)
		{
			if (taba[x] == 10 && x == oryg[i])
			{
				czy2 = 1;
				break;
			}
			if (taba[x] == 9)
			{
				if (x - 1 == oryg[i] - 1)
				{
					czy2 = 1;
					break;
				}
				else
				{
					czy2 = 0;
					tabb[x] = 0;
					taba[x - 1]++;
					if (taba[x - 1] < 10 && x - 1 != oryg[i] - 1)
					{
						for (int y = x - 1; y >= oryg[i]; --y)
						{
							tabb[y] = taba[y];
						}
						break;
					}
				}
			}
			else
			{
				czy2 = 0;
				tabb[x] = taba[x] + 1;
				for (int y = x - 1; y >= oryg[i]; --y)
				{
					tabb[y] = taba[y];
				}
				break;
			}
		}


		if (czy2)
		{
			bb *= 10;
			while (bb >= 1e16)bb /= 10;
			curr = i;
			tab[i] = bb;
			dodane[i]++;
			continue;
		}
		else
		{
			ll xd = 0;
			for (int x = 0; x < sz(tabb); ++x)
			{
				xd *= 10;
				xd += tabb[x];
			}
			tab[i] = xd;
			curr = i;
		}
	}

	for (int i = 0; i < N; ++i)
	{
		//cout << dodane[i] << "\t" << i << "\n";
		//if(dodane[i] < 0)break;
		ans += dodane[i];
	}

	cout << ans << "\n";

	return 0;
}