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#include <iostream>
#include <vector>
#include <algorithm>
#include <cmath>
#include <queue>
#include <stack>
#include <cstdio>
#include <set>
#include <map>
#include <string>
#include <queue>
#include <stack>
using namespace std;

typedef long long int LL;
typedef long double LD;
typedef vector<int> VI;
typedef vector<LL> VLL;
typedef vector<LD> VLD;
typedef vector<string> VS;
typedef pair<int, int> PII;
typedef vector<PII> VPII;

const int INF = 1000000001;
const LD EPS = 10e-9;

#define FOR(x, b, e) for(int x = b; x <= (e); ++x)
#define FORD(x, b, e) for(int x = b; x >= (e); --x)
#define REP(x, n) for(int x = 0; x < (n); ++x)
#define VAR(v, n) __typeof(n) v = (n)
#define ALL(c) (c).begin(), (c).end()
#define SIZE(x) ((int)(x).size())
#define FORE(i, c) for(VAR(i, (c).begin()); i != (c).end(); ++i)
#define MP make_pair
#define PB push_back
#define ST first
#define ND second
#define abs(a) ((a)<0 ? -(a) : (a))
#define max(a, b) ((a) > (b) ? (a) : (b))
#define min(a, b) ((a) < (b) ? (a) : (b))

const int MAX_N = 1000005;

bool areSameNines(const string& s, const int minLeftIdx)
{
    for(int i = int(s.size())-1; i >= minLeftIdx; --i)
        if(s[i] != '9')
            return false;

    return true;
}

string plusOne(const string& s, const int minLeftIdx)
{
    if(areSameNines(s, minLeftIdx))
    {
        return string(int(s.size())-minLeftIdx+1, '0');
    }

    string res;
    int carry = 0;

    for(int i = s.size()-1; i >= minLeftIdx; --i)
    {
        int sum = (s[i]-'0') + carry;
        if(i == s.size()-1)
            sum++;

        res.push_back(((sum%10)+'0'));
        carry = sum/10;
    }

    if(carry > 0)
        res.push_back((carry+'0'));

    reverse(res.begin(), res.end());
    return res;
}

int compare(const string& a, const string& b)
{
    if(a.size() > b.size())
        return 1;
    if(a.size() < b.size())
        return -1;

    for(int i = 0; i < a.size(); ++i)
    {
        if(a[i] < b[i])
            return -1;
        if(a[i] > b[i])
            return 1;
    }

    return 0;
}

int compare(const string& a, const int aSize, const string& b)
{
    if(aSize > b.size())
        return 1;
    if(aSize < b.size())
        return -1;

    for(int i = 0; i < aSize; ++i)
    {
        if(a[i] < b[i])
            return -1;
        if(a[i] > b[i])
            return 1;
    }

    return 0;
}

int findNumber(const string& prev, const string& next, string& res)
{
    const int compareRes = compare(prev, next);

    if(compareRes == -1)
    {
        res = next;
        return 0;
    }

    if(compareRes == 0)
    {
        res = next + '0';
        return 1;
    }

    const int prevLastSize = prev.size() - next.size();

    const int prefCompRes = compare(prev, next.size(), next);

    //cout << prefCompRes << endl;
    //cout << prevFirst << "-" << prevLast << endl;

    res = next;

    if(prefCompRes == -1)
    {
        res.append(prevLastSize, '0');
        return prevLastSize;
    }

    if(prefCompRes == 1)
    {
        res.append(prevLastSize+1, '0');
        return prevLastSize+1;
    }

    //string prevLast = prev.substr(next.size());
    //string pOne = plusOne(prevLast);

    res = prev.substr(0, next.size());
    string pOne = plusOne(prev, next.size());

    res.append(pOne);

    //cout << "pOne: " << pOne << endl;

    return pOne.size();
}

int main()
{
    int n;
    LL res = 0;
    string prev, curr, next;

    ios_base::sync_with_stdio(0);
    cin >> n;
    for(int i = 0; i < n; ++i)
    {
        cin >> curr;

        if(i > 0)
        {
            res += findNumber(prev, curr, next);
            //cout << "(prev, curr, next): " << prev << ", " << curr << ", " << next << endl;
        }
        else
        {
            next = curr;
        }

        prev = next;
    }

    cout << res << endl;

    return 0;
}