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#include <bits/stdc++.h>
using namespace std;

int ans=0;
int n;
const int N=2*1e5+5;
string a[N];

bool is_greater(string x, string y)
{
    if(x.size()>y.size())
        return 1;
    if(x.size()<y.size())
        return 0;
    for(int i=0; i<x.size(); ++i)
    {
        if(x[i]>y[i]) return 1;
        if(x[i]<y[i]) return 0;
    }
    return 0;
}

bool is_greater(string x, string y, int xd)
{
    for(int i=0; i<xd; ++i)
    {
        if(x[i]>y[i]) return 1;
        if(x[i]<y[i]) return 0;
    }
    return 0;
}

bool is_equal(string x, string y, int xd)
{
    for(int i=0; i<xd; ++i)
    {
        if(x[i]!=y[i]) return 0;
    }
    return 1;
}

bool is_equal(string x, int l, int p)
{
    for(int i=l; i<p; ++i)
    {
        if(x[i]=='9') continue;
        return 0;
    }
    return 1;
}


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

    cin>>n;
    for(int i=0; i<n; ++i)
        cin>>a[i];
    for(int i=1; i<n; ++i)
    {
        if(is_greater(a[i], a[i-1])==0)
        {
            if(a[i].size()==a[i-1].size())
            {
                a[i].push_back('0');
                ans++;
                continue;
            }
            if(is_greater(a[i], a[i-1], a[i].size()))
            {
                while(a[i].size()<a[i-1].size())
                {
                    a[i].push_back('0');
                    ans++;
                }
                continue;
            }
            if(is_equal(a[i], a[i-1], a[i].size()))
            {
                if(is_equal(a[i-1], a[i].size(), a[i-1].size()))
                {
                    for(int j=a[i].size(); j<=a[i-1].size(); ++j)
                    {
                        a[i].push_back('0');
                        ans++;
                    }
                    continue;
                }
                for(int j=a[i].size(); j<a[i-1].size(); ++j)
                {
                    a[i].push_back(a[i-1][j]);
                    ans++;
                }
                a[i][a[i].size()-1]++;
                continue;
            }
            for(int j=a[i].size(); j<=a[i-1].size(); ++j)
            {
                a[i].push_back('0');
                ans++;
            }
            continue;
        }
    }
    cout<<ans;
/*    for(int i=0; i<n; ++i)
    {
        cout<<a[i]<<"\n";
    }*/

    return 0;
}