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#include <iostream>
#include <string>

using namespace std;

int zeroes = 0;
int cnt = 0;
long long res = 0;

void fill_with_zeroes(string a, string b) {
	if(a.size() + zeroes > b.size()) {
		zeroes = a.size() + zeroes - b.size();
	} else {
		zeroes = 0;
	}
	cnt = 0;
}

void fill_with_zeroes_plus(string a, string b) {
	if(a.size() + zeroes >= b.size()) {
		zeroes = a.size() + zeroes - b.size() + 1;
	} else {
		zeroes = 0;
	}
	cnt = 0;
}

void increment(string aF, string aT, string b) {
//	cout << "Incrementation" << endl;
//	cout << "aF: " << aF << " + aT: " << aT << ", b:" << b << endl;
	int aTi = 1;
	if(aT != "") {
		aTi += stoi(aT+string(zeroes, '0'));
	}
	aTi += cnt;
	string aTn = to_string(aTi);
//	cout << "aTn: " << aTn << endl;
	zeroes += aT.size();
	if(aTn.size() > zeroes) {
		zeroes += 1;
		cnt = 0;
	} else {
		cnt = aTi;
	}
}

int main() {
	int n;
	cin >> n;
	string a, b;
	for(int i = 0; i < n; ++i) {
		cin >> b;
		if(i > 0) {
			if(b.size() > a.size()) {
				int filled_a = stoi(a+string(b.size()-a.size(), '0'));
				if(stoi(b) <= filled_a) {
					fill_with_zeroes_plus(a, b);
				} else {
					fill_with_zeroes(a, b);
				}
			} else if(b.size() == a.size() && stoi(b) > stoi(a)) {
				fill_with_zeroes(a, b);
			} else if(b.size() == a.size() && stoi(b) == stoi(a)) {
				increment(a, "", b);
			} else if(b.size() == a.size() && stoi(b) < stoi(a)) {
				fill_with_zeroes_plus(a, b);
			} else if(b.size() < a.size()) {
				string aF = a.substr(0, b.size());
				string aT = a.substr(b.size());
				if(aF < b) {
					fill_with_zeroes(a, b);
				} else if(aF == b) {
					increment(aF, aT, b);
				} else if(aF > b) {
					fill_with_zeroes_plus(a, b);
				}
			}
		}
		res += zeroes;
		a = b;
//		cout << a << endl;
//		cout << zeroes << ", " << cnt << ", " << res << endl;
//		cout << "----------------------------" << endl << endl;
	}
	cout << res << endl;
	return 0;
}