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#include<iostream>
#include<string>
using namespace std;

long long getpow(int n)
{
    switch(n)
    {
        case 0: return 1;
        case 1: return 10;
        case 2: return 100;
        case 3: return 1000;
        case 4: return 10000;
        case 5: return 100000;
        default: return 1000000;
    }
    return 1000000;
}

string add1(string s)
{
    s[s.length()-1]++;
    for(int i=s.length()-2; i>=0;i--)
    {
        if(s[i+1]>'9') 
        {
            s[i+1]='0';
            s[i]++;
        }
    }
    return s;
}

bool cmp(const string& a, const string& b)
{
    if(a.length() == b.length())
    {
        return a<b;
    }
    else return a.length()<b.length();
}

int main()
{
    ios_base::sync_with_stdio(false);

    int n;
    long long counter = 1;
    long long res=0;
    long long x=0;
    string cur;
    string prev="";

    cin>>n;
    while(n--)
    {
        cin >>cur;
        
        if(prev == cur)
        {
            if(counter < getpow(x))
            {
                counter++;
            }
            else
            {
                x++;
                counter = 1;
            }
            res+=x;
        }
        if(prev.length()+x < cur.length())
        {
            x=0;
            counter = 1;
        }

        if( !cmp(prev,cur) || x != 0)
        {
           //cout << (prev >=cur)<< (x!=0)<<endl;
            //cout <<prev<<" "<<cur<<endl;
            for(int i=0;i<max(prev.length(), cur.length()) && prev != "";i++)
            {
                if(i>=prev.length())
                {
                    long long maxcou = getpow(prev.length()+x-cur.length());
                    for(int j=0;j+i<cur.length() ;j++)
                    {
                        maxcou+=(cur[i+j]-'0')*getpow(x-j-1);
                    }
                    //cout <<"c: "<<counter<<" "<<maxcou<<endl;
                    if(counter < maxcou)
                    {
                        x -= cur.length() - prev.length();
                    }
                    else
                    {
                        x += prev.length() - cur.length() +1;
                        counter = 1;
                    }
                    res+=x;
                    break;
                }
                if(i>=cur.length())
                {
                    if(counter < getpow(x))
                    {
                        counter++;
                        res+= x + prev.length() - cur.length();
                        cur = prev;
                        break;
                    }
                    else
                    {
                        bool f=false;
                        for(int j = i ;j < prev.length();j++)
                        {
                            if(prev[j]!='9')
                            {
                                f=true;                        
                            }
                        }
                        if(f)
                        {
                            res+= x + prev.length() - cur.length();
                            cur = add1(prev);
                            counter = 1;
                            break;  
                        }
                        else
                        {
                            x += prev.length() - cur.length() +1;
                            counter = 1;
                            res+=x;
                            break;
                        }
                    }
                }
                if(prev[i] < cur[i])
                {
                    x+= prev.length() - cur.length();
                    counter = 1;
                    res+=x;
                    break;
                }
                if(prev[i] > cur[i])
                {
                    x+= prev.length() + 1 - cur.length();
                    res+=x;
                    break;
                }
            }
        }
        //cout <<":"<<x<<" "<<prev<<" "<<cur<<" "<<res<<" "<<endl;

        prev = cur;
    }

    cout <<res<<endl;

    return 0;

}