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#include <bits/stdc++.h>
using namespace std;

int main(){
	ios_base::sync_with_stdio(false);
	
	int N;
	cin >> N;
	
	long long int prev = 0, res = 0;
	long long int k;
	long long int ups = 0;
	
	while(N--) {
		cin >> k;
		res += ups;
		
		if(prev < k) {
			prev = k;
		} else {
			long long int L = k;
			long long int R = k;
			
			while(true) {
				if(R <= prev && prev < 10 * L) {
					res++;
					prev = 10 * L;
					break;
				}
				if(10 * L <= prev && prev < 10 * R + 9) {
					res++;
					prev = prev + 1;
					break;
				}
				L = 10 * L;
				R = 10 * R + 9;
				res++;
			}
			while(prev > 1e16 && prev % 10 == 0) {
				ups++;
				prev = prev / 10;
			}
		}
	}
	
	cout << res << endl;
	
	return 0;
}