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#include <iostream>
#include <stack>

using namespace std;


int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	int n; cin >> n;

	int res = 0;
	int last = 0;
	for (int i = 0; i < n; i++) {
		int act;
		cin >> act;

		if (act <= last) {
			int tmp = act;

			stack<int> numsAct;
			int countAct = 0;
			while (tmp > 0) {
				countAct++;
				numsAct.push(tmp % 10);
				tmp /= 10;
			}

			tmp = last;
			stack<int> numslast;
			int countlast = 0;
			while (tmp > 0) {
				countlast++;
				numslast.push(tmp % 10);
				tmp /= 10;
			}

			int status = 0;			//0 - wszystkie cyfry rowne, 1 - dopisac 0, bo wyjdzie wieksza, 2 - dopisac o jedno 0 wiecej
			while (!numsAct.empty()) {
				if (numsAct.top() > numslast.top()) {
					status = 1;
					break;
				}else if (numsAct.top() < numslast.top()) {
					status = 2;
					break;
				}
				numsAct.pop(); numslast.pop();
			}

			if (status == 0) {
				res += countlast - countAct;
				act = last + 1;
			}else {
				for (int i = 0; i < countlast - countAct + status - 1; i++) {
					res++;
					act *= 10;
				}
			}
		}
		last = act;
	}

	cout << res;
}