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#include <bits/stdc++.h>

using namespace std;

#define PB push_back
#define MP make_pair
#define fst first
#define snd second
#define int4 int32_t
#define LL long long
#define int LL
#define FOR(i,a,b) for (int (i) = (int)(a) - (int)(a > b); (i) != (int)(b) - (int)(a > b); (i) += ((a) < (b)) ? 1 : -1)
#define REP(b) FOR(i, 0, b)
#define REP1(b) FOR(i, 1, (b)+1)
#define REV(b) FOR(i, b, 0)
#define REV1(b) FOR(i, (b)+1, 1)
#define ITER(i, b) for (auto (i) : (b))
#define ALL(x) (x).begin(), (x).end()
#define sz(x) ((int)(x).size())
#define VI vector<int>
#define PII pair<int,int>
#define LD long double

template<class C> void minu(C& a4, C b4) { a4 = min(a4, b4); }
template<class C> void maxu(C& a4, C b4) { a4 = max(a4, b4); }

template<class TH> void _dbg(const char *sdbg, TH h)
{
    while(*sdbg==' ') sdbg++;
    if(*sdbg!='\"' && *sdbg!='\'')cerr<<" "<<sdbg<<"="<<h<<"\n";
    else cerr<<" "<<h<<"\n";
}
template<class TH, class... TA> void _dbg(const char *sdbg, TH h, TA... a)
{
    
    while(*sdbg==' ') sdbg++;
    if(*sdbg!='\"' && *sdbg!='\'')
    {
        cerr<<" ";
        while(*sdbg!=',')cerr<<*sdbg++;
        cerr<<"="<<h<<","; _dbg(sdbg+1, a...);
    }
    else
    {
        while(*sdbg!=',') sdbg++;
        cerr<<" "<<h<<","; _dbg(sdbg+1, a...);
    }
}

template<class T> ostream &operator<<(ostream &os, vector<T> V)
{
    os<<"[";for(auto vv:V)os<<vv<<",";return os<<"]";
} 

template<class L, class R> ostream &operator<<(ostream &os, pair<L,R> P)
{
    return os << "(" << P.fst << "," << P.snd << ")";
}


#ifdef LOCAL
#define debug(...) _dbg(#__VA_ARGS__, __VA_ARGS__)
#else
#define debug(...) (__VA_ARGS__)
#define cerr if(0)cout
#endif

const int maxn=200005;

string cen[maxn];
int dl[maxn];


bool pref_big(int pier_nr, int drug_nr)
{
    string &pier = cen[pier_nr];
    string &drug = cen[drug_nr];
    REP(min(sz(pier), sz(drug)))
    {
        if(pier[i] < drug[i]) return 1;
        if(pier[i] > drug[i]) return 0;
    }
    return 0;
}

bool pref_big_eq(int pier_nr, int drug_nr)
{
    debug(pier_nr, drug_nr);
    string &pier = cen[pier_nr];
    string &drug = cen[drug_nr];
    REP(min(sz(pier), sz(drug)))
    {
        debug(pier[i], drug[i], i);
        if(pier[i] < drug[i]) return 1;
        if(pier[i] > drug[i]) return 0;
    }
    return 1;
}

bool bigger(int pier, int drug)
{
    if(dl[pier]<dl[drug]) return 1;
    if(dl[pier]>dl[drug]) return 0;
    return pref_big(pier, drug);
}

void add0(string &a, int il)
{
    REP(il) a+='0';
}

string plus1(string a)
{
    a.back()++;
    FOR(i, sz(a), 0)
    {
        if(a[i]>'9') 
        {
            a[i]-=10;
            if(i>0) a[i-1]++;
            else
            {
                a='1'+a;
            }
        }
    }
    return a;
}

void kopi(int pier_nr, int drug_nr)
{
    string &pier = cen[pier_nr];
    string &drug = cen[drug_nr];
    REP(10)
    {
        if(i+1>sz(drug)) drug+=pier[i];
    }
}

int32_t main()
{
    ios_base::sync_with_stdio(0);
    int n;
    cin>>n;
    REP(n) cin>>cen[i+1];
    REP(n) dl[i+1]=sz(cen[i+1]);
    int sum=0;
    REP(n) sum+=dl[i+1];
    int wyn=0;
    cen[0]="";
    for(int i=0; i<=n; i++) cerr<<i<<" "<<cen[i]<<" "<<dl[i]<<endl; 
    FOR(i, 1, n+1)
    {
        wyn-=dl[i];
        debug(dl[i], wyn);
        
        if(!bigger(i-1, i))
        {
            if(dl[i-1]<=18)
            {
                debug(i, cen[i], cen[i-1]);
                string &tmp = cen[maxn-1];
                tmp = cen[i];
                dl[maxn-1]=dl[i];
                int il=0;
                while(!bigger(i-1, maxn-1))
                {
                    tmp+='9';
                    il++;
                    dl[maxn-1]++;
                }
                debug(il);
                if(dl[i]+il>dl[i-1])
                {
                    add0(cen[i], il);
                    debug("pier", cen[i]);
                }
                else if(pref_big(i-1, i))
                {
                    add0(cen[i], il);
                    debug("drug", cen[i]);
                }
                else
                {
                    cen[i]=plus1(cen[i-1]);
                    debug("trze", cen[i]);
                }
                dl[i]=sz(cen[i]);
            }
            else
            {
                debug("else");
                if(pref_big(i-1, i))
                {
                    dl[i]=dl[i-1];
                    add0(cen[i], 10);
                }
                else if(pref_big_eq(i-1, i))
                {
                    dl[i]=dl[i-1];
                    kopi(i-1, i);
                }
                else
                {
                    dl[i]=dl[i-1]+1;
                    add0(cen[i], 10);
                }
            }
        }
        wyn+=dl[i];
        debug(dl[i], wyn);
        cerr<<endl;
    }
    for(int i=0; i<=n; i++) cerr<<i<<" "<<cen[i]<<" "<<dl[i]<<endl; 
    printf("%lld\n", wyn);
}