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#include <bits/stdc++.h>
using namespace std;
bool cmp(const string & a, const string & b)
{
    if(a.size() > b.size())
        return true;
    if(a.size() < b.size())
        return false;
    for(int i = 0; i < (int)a.size(); i++)
    {
        if(a[i] > b[i])
            return true;
        if(b[i] > a[i])
            return false;
    }
    return true;
}
int main()
{
    int N;
    cin>>N;
    string a,b;
    long long result = 0;
    cin>>a>>b;
    for(int i = 0; i < N - 1; i++)
    {
        if(cmp(a,b))
        {
            long long  c = a.size() - b.size();
            if(a[0] < b[0])
            {
                for(long long  j = 0; j < c; j++)
                    b += "0";
                result += c;
            }
            else if(a[0] == b[0])
            {
                for(long long  j = 0; j < c; j++)
                {
                    char d = a[b.size()];
                    if(d != '9')
                    {
                        b += a[b.size()]+1;
                    }
                    else
                    {
                        b += "9";
                    }
                }
                result += c;
                if(cmp(a,b))
                {
                    b += "0";
                    result++;
                }
            }
            else if(a[0] > b[0])
            {
                for(long long  j = 0; j <= c; j++)
                    b += "0";
                result += c + 1;
            }
        }
        a = b;
        cin>>b;
    }
    cout<<result<<endl;
}