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#include <list>
#include <string>
#include <iostream>

using namespace std;

bool operator<= ( list<char>& x, list<char>& y )
{
    if ( x.size() < y.size() )
    {
        return true;
    }
    else if ( x.size() > y.size() )
    {
        return false;
    }
    else
    {
        auto xi = x.begin();
        auto yi = y.begin();

        while ( xi != x.end() )
        {
            if ( ( *xi ) < ( *yi ) )
            {
                return true;
            }
            else if ( ( *xi ) > ( *yi ) )
            {
                return false;
            }

            ++xi;
            ++yi;
        }

        return true;
    }
}

int main()
{
    uint32_t N;
    cin >> N;

    string line;
    getline( cin, line );

    list<list<char>> numbers;

    while ( N-- )
    {
        getline( cin, line );

        numbers.push_back( list<char>() );

        for ( const char& c : line )
        {
            numbers.back().push_back( c );
        }
    }

    uint32_t m = 0U;

    for ( auto ni = numbers.begin(); ni != numbers.end(); )
    {
        list<char>& x = *( ni++ );
        list<char>& y = *ni;

        if ( y <= x )
        {
            while ( y <= x )
            {
                y.push_back( '0' );
                m++;
            }
        }
    }

    cout << m;

    return 0;
}