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#include <bits/stdc++.h>
#define deb(x) 
#define fr front
#define pob pop_back
#define last(V) V[V.size()-1]
#define sp <<" "<<
#define ent <<"\n"
#define mp make_pair
#define pb push_back
#define pu push
#define st first
#define e second.st
#define ad second.second
#define VI vector<int>
#define VII vector<pair<int,int> >
#define inf 1000000000
#define uns unsigned
#define ll long long
#define ld long double
#define uint unsigned int

using namespace std;
const int MN=0;
ll t[15];
vector <pair<ll,pair<ll,ll> > > V;
int main()
{
	ios_base::sync_with_stdio(0);
	cin.tie(0);
    t[1]=10;
    for(int i=2;i<15;i++)
        t[i]=t[i-1]*10;
	ll n,x,odp=0,ca=1;
	cin>>n;
    for(int i=0;i<n;i++)
    {
        cin>>x;
        V.pb({x,{0,0}});
    //    V.pb({1,{0,0}});
    }
    for(int i=1;i<n;i++)
    {
        if(V[i].e<V[i-1].e)
        {
     //       cout<<"case :" sp 1 ent;
            odp+=V[i-1].e-V[i].e;
            V[i].ad+=V[i-1].e-V[i].e;
            V[i].e=V[i-1].e;
        }
        while(V[i].st<V[i-1].st && V[i].e==V[i-1].e)
        {
  //          cout<<"case :" sp 2 ent;
            odp++;
            V[i].ad++;
            V[i].st*=10;
            if(inf<V[i].st)
            {
                V[i].e++;
                V[i].st/=10;
            }
        }
 //       cout<<"elo" sp i sp ca sp V[i].st sp V[i-1].st sp V[i].e sp V[i-1].e ent;
        if(V[i].st==V[i-1].st && V[i].e==V[i-1].e){
            if(V[i].ad==0)
            {
    //        cout<<"case :" sp 3 ent;
                odp++;
                V[i].ad++;
                V[i].st*=10;
                if(inf<V[i].st)
                {
                    V[i].e++;
                    V[i].st/=10;
                }

            }else{
      //      cout<<"case :" sp 4 ent;
                ca++;
                if(ca<=t[V[i].ad])
                {
                    //ok, miescm sie
                }else{
                    ca=1;
                    odp++;
                    V[i].ad++;
                    V[i].st*=10;
                    if(inf<V[i].st)
                    {
                        V[i].e++;
                        V[i].st/=10;
                    }

                }
            }

        }else{
      //      cout<<"case :" sp 5 ent;
            ca=1;
        }
    }
/*    for(int i=0;i<n;i++)
    {
        cout<<i sp V[i].st sp V[i].e sp"ayy lmao" sp V[i].ad ent;
    }    
*/    cout<< odp ent;
	return 0;
}