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

#define st first
#define nd second
#define pb push_back
#define mp make_pair
#define klar(v) memset(v, 0, sizeof(v))
#define bust ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
#define gcd(a, b) __gcd(a, b);
#define debug(x) cout << #x << " " << x << endl;
#define endl "\n"

typedef vector<int> vi;
typedef vector<pair<int, int> > vpii;
typedef vector<long long> vll;
typedef pair<int, int> pii;
typedef pair<long long, long long> pll;
typedef long long ll;
const int maxn = 5e5+100;

ll arr[maxn];

int dll(ll x){
    int ret = 0;
    while(x > 0){
        ret++;
        x /= 10;
    }
    return ret;
}

ll mlicz(ll pref, ll dr, ll rr){
    ll ret = 0;
    ret += pref;
    for(int i = 0; i < dr; i++)
        ret *= 10;
    ret += rr;
    return ret;
}

ll wyc(ll l, int dl){
    ll h = dll(l);;
    while(h-dl > 0){
        l /= 10;
        h--;
    }
    return l;
}

void wyplicz(ll pref, ll dr, ll rr){
    cout << "liczba: ";
    //    cout << pref << " " << dr << " " << rr << endl;
    string wyp;
    //    wyp += to_string(pref);
    cout << pref;
    int k = dr-dll(rr);
    while(k > 0){
        cout << 0;
        k--;
    }
    if(rr != 0)cout << rr;
    cout << endl;
}

int main(){
    bust
    int n;
    cin >> n;
    for(int i = 1; i <= n; i++)
        cin >> arr[i];
    ll pref = arr[1], dr = 0, rr = 0;
    //    cout << "zero if" << endl;
    //    cout << pref << endl;
    ll ans = 0;
    for(int i = 2; i <= n; i++){
        int dla = dll(arr[i]), dlb = dll(pref);
        if(dla >= dlb+dr){
//                        cout << "pierwszy if" << endl;
            while(dr > 0){
                pref *= 10;
                dr--;
            }
            pref += rr;
            rr = 0;
//            debug(pref);
            if(pref < arr[i])
                pref = arr[i];
            else if(pref > arr[i]){
                while(arr[i] < pref){
                    arr[i] *= 10;
                    ans++;
                }
//                cout << arr[i] << " " << pref << endl;
                if(arr[i] == pref)arr[i]++;
                pref = arr[i];
            }
            else{
                ans++;
                dr++;
            }
        }
        else{
//                        cout << "drugi if" << endl;
            if(dlb+dr < 16){
                while(dr > 0){
                    pref *= 10;
                    dr--;
                }
                pref += rr;
                rr = 0;
            }
            else{
                while(pref < 1e9 and dr > 0){
                    pref *= 10;
                    dr--;
                }
            }
            //            cout << "params: " << pref << " " << dr << " " << rr << endl;
            ll l = wyc(pref, dla);
            if(l < arr[i]){
                dr += (dll(pref)-dla);
                pref = arr[i];
                rr = 0;
            }
            else if(l == arr[i]){
                //                cout << "zagniezdzony drugi" << endl;
                if(dr == 0){
                    pref++;
                    l = wyc(pref, dla);
                    //                    cout << "l and pref\n" <<  l << " " << pref << endl;
                    if(l != arr[i]){
                        dr = dll(pref)-dll(arr[i]);
                        if(dll(pref) == dll(pref-1))dr++;
                        pref = arr[i];
                    }
                }
                else{
                    rr++;
                }
            }
            else{
                dr += (dll(pref)-dla)+1;
                pref = arr[i];
            }
            ans += dll(pref)+dr-dll(arr[i]);
            //            cout << "params przy wyjsciu: " << l << " " << pref << " " << dr << " " << rr << endl;
        }
//                wyplicz(pref, dr, rr);
        //        debug(ans);
    }
    cout << ans << endl;
}