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#include <bits/stdc++.h>

using namespace std;
typedef vector<int> VI;
typedef long long LL;
typedef pair<int,int> PI; 
typedef pair<LL,LL> PLL;
typedef unsigned long long ULL;
typedef pair<double,double> PD;

#define FOR(x, b, e) for(int x = b; x<= (e); x++)
#define FORD(x, b, e) for(int x = b; x>= (e); x--)
#define REP(x, n) for(int x = 0; x<(n); ++x)
#define ALL(c) (c).begin(), (c).end()
#define SIZE(x) ((int)(x).size())

#define PB push_back
#define IN insert
#define ST first
#define ND second
#define INF 2000000011
#define MOD 1000000007

#define MAXSIZE 

LL n_cyfr(LL n){
	LL t=0;
	
	while(n){
		n/=10;
		t++;
	}
	
	return t;
}

LL wyn=0;

int main(){	//rob wlasna artytmetyke
	ios::sync_with_stdio(0); cin.tie(0);
	
	int n;
	cin>>n;
	
	LL ost;
	cin>>ost;
	
	LL stala=0;
	
	REP(i,n-1){
		
		
		LL t1;
		cin>>t1;
		
	//	cout<<ost<<": "<<t1<<"\n";
		wyn+=stala;
		
		if(t1>ost)
			ost=t1;
		else{	//ost>=t1
			
			LL cat=ost+1;
			LL diff_cyfr=n_cyfr(cat)-n_cyfr(t1);
			
			REP(i,diff_cyfr)
				cat/=10LL;
			
			if(cat<t1){
				REP(i,diff_cyfr)
					t1*=10LL;
					
				wyn+=diff_cyfr;
				ost=t1;
			}
			else if(cat==t1){
				ost++;
				wyn+=diff_cyfr;
			}
			else{
				REP(i,diff_cyfr+1)
					t1*=10LL;
				wyn+=diff_cyfr+1;
				ost=t1;
			}
		}
		
		
		while(n_cyfr(ost)>14){
	//		cout<<"HEj";
			
			ost/=10;
			stala++;
		}
	}
	
	cout<<wyn<<"\n";
	
	return 0;
}