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#define _USE_MATH_DEFINES
#include <bits/stdc++.h>
using namespace std;

#define FOR(i,a,n) for (auto i ## __ = (n), i = (a); i <= i ## __; ++i)
#define FORD(i,a,n) for (auto i ## __ = (n), i = (a); i >= i ## __; --i)
#define REP(i,n) FOR(i,0, n - 1)
#define ALL(h) begin(h), end(h)
#define EB emplace_back
#define X first
#define Y second
#define V vector
#define tpv typedef V<

typedef long long LL;
typedef pair<int, int> PII;
tpv int> VI;
tpv VI> VVI;
tpv PII> VPII;
tpv LL> VLL;

constexpr char nl = '\n';
#define endl nl
#define ris return *this
#define tem template<class t

tem, class u> inline void mini(t& a, u&& b) { if (b < a) a = b; }
tem, class u> inline void maxi(t& a, u&& b) { if (b > a) a = b; }
int ceil2(int h) { return h < 2 ? 1 : 1 << (sizeof(h) * 8 - __builtin_clz(h - 1)); }

tem> struct Dump { t a, b; };
tem> auto dump(t&& h) -> Dump<decltype(begin(h))> { return {ALL(h)}; }
tem> auto stub(t* h) -> decltype(cerr << *h, 0);
tem> char stub(...);
#define enif(o) tem> typename enable_if<sizeof stub<t>(0) o 1, debug&>::type operator<<(t h)
#define dor > debug& operator<<
struct debug {
#ifdef DEBUG
#define deb debug()
	~debug() { cerr << nl; }
	enif(!=) { cerr << boolalpha << h; ris; }
	enif(==) {
		*this << '{';
		for (auto a = begin(h), b = end(h); a != b;)
			*this << *a++ << &" "[a == b];
		ris << '}';
	}
	tem, class u dor(pair<t, u> p) { ris << '(' << p.X << ", " << p.Y << ')'; }
	tem dor(Dump<t> d) {
		*this << "{\n";
		for (t a = d.a, c = a; a != d.b; ++a)
			*this << "  " << distance(c, a) << ": " << *a << nl;
		ris << '}';
	}
#else
	operator int() { return 0; }
#define deb 0 and debug()
	tem dor(t&&) { ris; }
#endif
};

#define imie(h...) #h ": " << (h) << " "
#define LOG(h...) deb << imie(h)
#define DOG(h...) deb << #h ": " << dump(h) << " "

struct state {
	int umut_digits = 0;
	LL umut = 0; // unmutable
	int no_digits = 0;
	LL no = 0;
};

ostream& operator<<(ostream& os, const state& s) {
	return os << "[( " << s.umut << " " << s.umut_digits << " )( " << s.no << " " << s.no_digits << " )] = "
		<< (s.umut_digits > 0 ? to_string(s.umut) : "") << setw(s.no_digits) << setfill('0') << (s.no_digits > 0 ? to_string(s.no) : "");
		;
}

int digits(LL x) {
	int res = 0;
	while (x) {
		++res;
		x /= 10;
	}
	return res;
}

LL trim_to(LL x, int digits) {
	LL res = 0;
	LL pow10 = 1;
	while (x and digits--) {
		res += pow10 * (x % 10);
		x /= 10;
		pow10 *= 10;
	}
	return res;
}

LL power10[] = {1ll, 10ll, 100ll, 1000ll, 10000ll, 100000ll, 1000000ll, 10000000ll, 100000000ll, 1000000000ll, 10000000000ll, 100000000000ll, 1000000000000ll, 10000000000000ll, 100000000000000ll, 1000000000000000ll, 10000000000000000ll, 100000000000000000ll, 1000000000000000000ll};

bool operator<(state a, state b) {
	// LOG(a) imie(b);
	int adig = a.umut_digits + a.no_digits;
	int bdig = b.umut_digits + b.no_digits;
	if (adig < bdig)
		return true;
	if (adig > bdig)
		return false;
	
	// Have the same length
	// compare
	string astr(30, 0), bstr(30, 0);
	{
		int pos = min((int)astr.size(), adig) - 1;
		LL an = a.no;
		LL bn = b.no;
		while (an or bn) {
			astr[pos] = an % 10;
			an /= 10;
			bstr[pos] = bn % 10;
			bn /= 10;
			--pos;
		}
	}

	auto decompose = [](const state& x, string& str) {
		int pos = x.umut_digits - 1;
		LL xum = x.umut;
		while (xum) {
			str[pos--] = xum % 10;
			xum /= 10;
		}
		assert(xum == 0);
		assert(pos == -1);
	};

	decompose(a, astr);
	decompose(b, bstr);
	// LOG(VI(ALL(astr)));
	// LOG(VI(ALL(bstr)));
	return astr < bstr;
}

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

	int n;
	cin >> n;
	LL res = 0;
	state prev, curr;
	cin >> prev.umut;
	prev.umut_digits = digits(prev.umut);
	LOG(prev);
	while (--n) {
		deb << "=================================";
		cin >> curr.umut;
		LOG(curr.umut);
		curr.umut_digits = digits(curr.umut);
		curr.no = 0;
		curr.no_digits = max(prev.umut_digits + prev.no_digits - curr.umut_digits, 0);
		int digits_added = curr.no_digits;
		if (prev < curr) {
			// done
		} else if (prev.umut_digits <= curr.umut_digits) {
			curr.no = trim_to(prev.no + 1, curr.no_digits);
			if (prev < curr) {
				// done
			} else {
				curr.no = 0;
				++curr.no_digits;
				++digits_added;
			}
		} else {
			// prev.umut_digits > curr.umut_digits
			// copy digits from the previous number and try to add one to the no
			state curr_before = curr;
			int diff = prev.umut_digits - curr.umut_digits;
			LL prev_mut_part = trim_to(prev.umut, diff);
			LOG(diff) imie(prev_mut_part);
			if (curr.no_digits - diff < 8) {
				// We cannot move the digit to the unmutable part
				// So move the digits to the mutable part
				curr.no = trim_to(prev.no + prev_mut_part * power10[prev.no_digits] + 1, curr.no_digits);

			} else {
				// Move the digits to the unmutable part
				curr.umut = curr.umut * power10[diff] + prev_mut_part;
				curr.umut_digits += diff;
				curr.no_digits -= diff;
				curr.no = trim_to(prev.no + 1, curr.no_digits);
			}

			if (prev < curr) {
				// done
			} else {
				// need more digits
				curr = curr_before;
				++curr.no_digits;
				++digits_added;
			}
		}

		LOG(prev) imie(curr);
		res += digits_added;
		LOG(res) imie(digits_added);
		prev = curr;
	}

	cout << res << nl;
	return 0;
}