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#include <iostream>

using namespace std;

unsigned long long ddd(unsigned long long a)
{
	unsigned long long res = 0;
	while (a > 0) {
		res++;
		a = a/10;
	}
	return res;
}

unsigned long long mmm(unsigned long long a)
{
	unsigned long long res = 1;
	while (a+1 > 0) {
		res = res*10;
		a--;
	}
	return res;
}

int main()
{
	ios_base::sync_with_stdio(false);

	int N;
	cin >> N;
	unsigned long long sum = 0;

	long long prev = -1;
	long long dd = 0;
	for (int i = 0; i < N; i++) {
		long long a;
		cin >> a;
		long long aa = a;

		if (prev < 1e15) {
			long long d = 1;
			prev++;
			while (a*10<prev) {
				a = a*10;
				d = d*10;
				sum++;
			}

			if (a < prev) {
				if (a+d-1 < prev || a == aa) {
					a = a*10;
					sum++;
				} else {
					a = prev;
				}
			}
			prev = a;
		} else {
			long long dprev = ddd(prev);
			if (dd == 0)
				dd = dprev;

			long long da = ddd(a);
			long long cutprev = prev/mmm(dprev-da-1);
			if (a < cutprev)
				dd++;
			if (a != cutprev)
				prev = a*mmm(15-da);
			sum += dd-da;
		}
	}

	cout << sum << endl;

	return 0;
}