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#include <iostream>

using namespace std;

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

	int n;
	int pop, tera, sum = 0;
	bool stop = false;
	cin >> n;
	n--;
	cin >> pop;
	for (int i = 0; i < n; i++) {
		cin >> tera;
		stop = false;
		while (tera < pop) {
			tera *= 10;
			sum++;
			for (int j = 1; j < 10 && tera <= pop; j++) {
				tera++;
			}
		}
		pop = tera;
	}
	cout << sum;

	return 0;
}