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#include "iostream"
#include "string"

using namespace std;

int n, a, b, c; // c -wynik
string sa, sb;

int main()
{
	cin.tie();
	iostream::sync_with_stdio(0);
	cin >> n;
	cin >> sa; a = sa.size();
	for (int i = 1; i < n; i++) {
		cin >> sb; b = sb.size();
		if (b <= a)
		{
			bool changed = false; string st; int bp = b;
			while (b < a) {
				b++; sb += '0';
				c++;
			}
			for (int j = 0; j < a; j++) {
				if (sa[j] < sb[j]) {
					changed = true;
					break;
				}
				else if (sa[j] > sb[j])
					break;
			}
			if (b <= a && !changed) {
				for (int j = a-1; j >= 0; j--) {
					if (sa[j] < sb[j]) {
						changed = false;
						break;
					}
					if(sa[j]!='9'&&bp<=j) {
						sb.replace(j, j, to_string(atoi(&sa[j]) + 1)); changed = true;
						break;
					}
				}
				if (!changed) {
					b++;
					c++;
					sb += '0';
				}
			}
			//cout << "sb:" << sb << endl;
		}
		a = b;
		sa = sb;
	}
	cout << c;
	return 0;
}