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#include <iostream>

#define uint unsigned int
#define LL long long

using namespace std;

const short threshold = 15;

uint n;
LL previous, current;

short digitsCount[2];
LL zeros[2];

LL pow[19]; //tablica z kolejnymi potegami 10

void GetDigits(short tab, LL num)   //wpisywanie kolejnych cyfr liczby do danej tablicy (w kolejnosci odwroconej!)
{
    short index = 0;
    while(num > 0)
    {
        num /= 10;
        index++;
    }
    digitsCount[tab] = index;
}

int main()
{
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);

    pow[0] = 1;
    for(uint i = 1; i < 19; i++)
        pow[i] = pow[i-1] * 10;

    LL result = 0;

    cin >> n;
    cin >> previous;

    for(uint i = 1; i < n; i++)
    {
        cin >> current;

        if(current > previous && zeros[0] == 0)
        {
            previous = current;
            digitsCount[0] = 0;
            continue;
        }

        if(digitsCount[0] == 0) GetDigits(0, previous);
        GetDigits(1, current);

        LL rest = 0;
        short delta = digitsCount[0] - digitsCount[1];  //roznica w liczbie cyfr miedzy obecna liczba a poprzednia
        LL zerosDelta = zeros[0];

        current *= pow[delta];
        digitsCount[1] += delta;
        zeros[1] = zeros[0];
        result += zerosDelta + delta;

        if(delta > 0)
        {
            rest = previous % pow[delta];
            if(previous - rest == current)
            {
                if((rest + 1) % pow[delta] == 0)
                {
                    if(digitsCount[1] == threshold)
                    {
                        zeros[1]++;
                    }
                    else
                    {
                        current *= 10;
                        digitsCount[1]++;
                    }
                    result++;
                }
                else current += rest + 1;
            }
            else if(current < previous)
            {
                if(digitsCount[1] == threshold)
                {
                    zeros[1]++;
                }
                else
                {
                    current *= 10;
                    digitsCount[1]++;
                }
                result++;
            }
        }
        else
        {
            if(current < previous)
            {
                if(digitsCount[1] == threshold)
                {
                    zeros[1]++;
                }
                else
                {
                    current *= 10;
                    digitsCount[1]++;
                }
                result++;
            }
            else if(current == previous && zeros[1] == 0)
            {
                if(digitsCount[1] == threshold)
                {
                    zeros[1]++;
                }
                else
                {
                    current *= 10;
                    digitsCount[1]++;
                }
                result++;
            }
        }

        previous = current;
        digitsCount[0] = digitsCount[1];
        zeros[0] = zeros[1];
    }

    cout << result;

    return 0;
}