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#include <iostream>
#include <algorithm>

using namespace std;

const int N = 200005;

unsigned long long int ile( unsigned long long int n )
{
    unsigned long long int r = 0;
    if( n == 0 ) return 1;
    else
    {
        while( n > 0 )
        {
            r ++;
            n /= 10;
        }
    return r;
    }
}

unsigned long long int wszystkie[N];
unsigned long long int a[N];

unsigned long long int CE( unsigned long long int a, unsigned long long int b )
{
    unsigned long long int d = ile(a) - ile(b);
    unsigned long long int pow = 1;
    unsigned long long int v = a;
    for( int i = 0; i < d; i ++ )
    {
        v /= 10;
        //pow *= 10;
    }
    //unsigned long long int v = a/pow;
    return v;
}

struct para
{
    unsigned long long int d;
    bool flag;
};

bool f( unsigned long long int k )
{
    bool flag = false;
    k ++;
    int r = 10;
    while( true )
    {
        if( k == r )
        {
            flag = true;
            break;
        }
        if( r > k ) break;
        r *= 10;
    }
    return flag;
}

para DE( unsigned long long int a, unsigned long long int b )
{
    unsigned long long int c = CE(a,b);
    int e = ile(a) - ile(b);
    unsigned long long int pow = 1;
    for( int i = 0; i < e; i ++ )
    {
        pow *= 10;
    }
    unsigned long long int v = a - pow*c;
    para X;
    X.d = v;
    bool w;
    //cout << ile(v) << " " << e << "\n";
    if( ile(v) == e && f(v) == true ) w = true;
    else w = false;
    X.flag = w;
    return X;
}

int main()
{
    ios_base::sync_with_stdio(0);
    int n;
    cin >> n;
    //para Y = DE( 599999900000, 59 );
    //cout << Y.d << "\n";
    //if( Y.flag == false ) cout << "NIE";
    //else cout << "TAK";
    //cout << CE(599999900000, 59);
    unsigned long long int tab[n];
    for( int i = 0; i < n; i ++ )
    {
        cin >> tab[i];
        wszystkie[i] = ile(tab[i]);
        a[i] = tab[i];
    }
    wszystkie[0] = ile(tab[0]);
    a[0] = tab[0];
    for( int i = 1; i < n; i ++ )
    {
        unsigned long long int b = tab[i];
        if( wszystkie[i - 1] == ile(b) )
        {
            if( a[i-1] >= b )
            {
                a[i] = b*10;
                if( a[i] > 100000000000000000 ) a[i] /= 10;
                wszystkie[i] = ile(b) + 1;
            }
        }
        else if( wszystkie[i-1] > ile(b) )
        {
            unsigned long long int c = CE(a[i-1],b);
            //cout << b << " CE =" << c <<" ";
            if( b > c )
            {
                a[i] = b;
                int r = 0;
                while( r < wszystkie[i-1] - ile(b) )
                {
                    a[i] *= 10;
                    if( a[i] > 100000000000000000 )
                    {
                        a[i] /= 10;
                        break;
                    }
                    r ++;
                }
                wszystkie[i] = wszystkie[i-1];
            }
            else if( b == c )
            {
                if( wszystkie[i-1] - ile(b) < 18 )
                {
                    unsigned long long int d = DE(a[i-1],b).d;
                    //cout << "panek to:" << d << "\n";
                    if( DE(a[i-1],b).flag == false )
                    {
                        a[i] = a[i - 1] + 1;
                        wszystkie[i] = wszystkie[i-1];
                    }
                    else
                    {
                        a[i] = b;
                        int r = 0;
                        while( r < wszystkie[i-1] - ile(b) + 1 )
                        {
                            a[i] *= 10;
                            r ++;
                            if( a[i] > 100000000000000000 )
                            {
                                a[i] /= 10;
                                break;
                            }
                        }
                        wszystkie[i] = wszystkie[i-1] + 1;
                    }
                }
                else
                {
                    a[i] = a[i-1];
                    wszystkie[i] = wszystkie[i-1];
                }
            }
            else if( b < c )
            {
                a[i] = b;
                int r = 0;
                while( r < wszystkie[i-1] - ile(b) + 1 )
                {
                    a[i] *= 10;
                    r ++;
                    if( a[i] > 100000000000000000 )
                    {
                        a[i] /= 10;
                        break;
                    }
                }
                wszystkie[i] = wszystkie[i-1] + 1;
            }
        }
        //cout << a[i] << "\n";
        //cout << wszystkie[i] << " " << a[i] << "\n";
    }
    unsigned long long int wynik = 0;
    for( int i = 0; i < n; i ++ )
    {
        wynik += ( wszystkie[i] - ile(tab[i]) );
    }
    cout << wynik;
    return 0;
}