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#include <stdio.h>
#include <time.h>
#include <math.h>
#include <stdlib.h>
#include <string.h>
#include <map> 
#include <string>
#include <vector>  
#include <iostream>  
#include <sstream> 
#include <queue>
#include <algorithm>   
#include <assert.h>


using namespace std;

#define ll long long
#define PB 		push_back
#define FOR(a,start,end) 	for(int a=int(start); a<int(end); a++)
#define INF 		INT_MAX
#define SORT(a) 	sort(a.begin(),a.end()) 
#define CL(a,x) 		memset(a,x,sizeof(a))
#define REP(a,x)	for(int a=0;a<x;a++)
#define REP1(a,x)	for(int a=1;a<=x;a++)
#define MP 		make_pair



typedef vector<int>     vi;
typedef pair<int, int>     pii;
typedef vector<string> vs;
typedef vector<pii> vii;
typedef vector<vector<int> > vvi;
typedef vector<vector<string> > vvs;
typedef vector<pair<string, string> > vss;
typedef pair<string, string> pss;
typedef pair<int, pii> ppii;
typedef vector<ppii> vppii;
typedef vector<vector<pii> > vvii;
typedef vector<vvi> vvvi;


ll z;
int n, k, a, b, c, i, j, q, d, s;
vi vk, va, vb, vk1, vk2;
string w, w0;
vs vw;
char zn;
/*
#define LOCAL

#ifdef LOCAL
#include <time.h>
#else
#include <sys/time.h>
#endif
double getTime() {
#ifdef LOCAL
return ((double)clock() / CLOCKS_PER_SEC);			//CPU time on Windows

#else
timeval t;
gettimeofday(&t, NULL);
return t.tv_sec + t.tv_usec * 1e-6;	//wall clock time on Linux
#endif
}
*/
string dod1(string w) {

	int i = w.size() - 1;
	while (w[i] == '9') {
		w[i++] = '0';
	}
	w[i] += 1;
	return w;

}
double cz1, cz2;
int main() {
	//	freopen( "c:\\wojtek\\uva\\pa\\debug\\ban10.in", "rt", stdin);  

	//pi=2*acos(0.0);
	//while(1){
	//cz1 = getTime();

	cin >> n;
	z = 0;
	//vk.clear();
	vw.clear();
	for (int i = 0; i < n; i++) {
		cin >> w;
		vw.push_back(w);
	}
	
	k = vw[0].size();		//d�ugo�c liczby
	w = vw[0];

	for (int i = 1; i < n; i++) {
		c = vw[i].size();
		if (c > k) {
			w = vw[i];
			k = c;
			continue;
		}
		if (c < k) {
			q = vw[i].compare(w.substr(0, c));
			if (q < 0) {
				z += k - c + 1;
				w0.assign(k - c + 1, '0');
				
				w = vw[i] + w0;
				//w = vw[i].append(k - c + 1, '0');
				k++;
			}
			else if (q == 0) {
				w0.assign(k - c, '9');
				if (w.substr(c, k - c).compare(w0) == 0) {
					w0.assign(k - c + 1, '0');
					w = vw[i] + w0;
					//w = vw[i].append(k - c + 1, '0');
					z += k - c + 1;
					k++;
				}
				else {
					w = vw[i] + dod1(w.substr(c, k - c));
					z += k - c;
				}
			}
			else {
				w0.assign(k - c, '0');
				w = vw[i] + w0;
				z += k - c;
			}
		}
		else if (c == k) {
			q = vw[i].compare(w);
			if (q <= 0) {
				w = vw[i] + '0';
				z++;
				k++;
			}
			/*
			else if (q == 0) {
				w = vw[i] + '0';
				z++;
				k++;
			}
			*/
			else {
				w = vw[i];
			}
		}
		
	}

	cout << z << endl;

	//cz2 = getTime();
	//cerr << cz2 - cz1 << endl;
	//}
	return 0;

}