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#include <iostream>
#include <string>
#include <stdio.h>
#include <stdlib.h>
#include <sstream>
using namespace std;

unsigned long long X,D,N,odp;

unsigned long long Opt(unsigned long long a, unsigned long long b)
{
    stringstream ss;
    ss<<a;
    string A=ss.str();
    stringstream sd;
    sd<<b;
    string B=sd.str();

    for(int i=0; i<B.size(); i++)
    {
        if(B[i]!=A[i])
        {
            while(b<a)
            {
                b*=10;
                odp++;
            }

            return b;
        }
    }

    odp+=A.size()-B.size();

    for(int i=A.size()-1; i>=B.size(); i--)
    {
        if(A[i]!='9')
        {
            A[i]++;
            stringstream sstr(A);
            unsigned long long c;
            sstr>>c;
            return c;
        }
    }


    odp++;


    return a*10;

}

int main()
{
    cin>>N;

    cin>>X;

    for(int i=1; i<N; i++)
    {
        cin>>D;
        if(X==D)
        {
            D*=10;
            odp++;
        }
        else if(X>D)
        {
            D=Opt(X,D);
        }
        X=D;
    }

    cout<<odp;

    return 0;
}