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#include <bits/stdc++.h> // Justyna Jaworska
using namespace std;     // XIII LO Szczecin

#define FOR(i,a,n) for (auto i = (a), i##__ = (n); i <= i##__; ++i)
#define REP(i,n) FOR(i,0,(n)-1)
#define FORD(i,a,n) for (auto i = (a), i##__ = (n); i >= i##__; --i)
#define REPD(i,n) FORD(i,(n)-1,0)
#define ALL(x) x.begin(), x.end()
#define SZ(x) ((int) x.size())
#define EB emplace_back
#define ST first
#define ND second
#define V vector
#define A array
constexpr char nl = '\n';

template<class A, class B> A&& mini(A &&a, B &&b) { if (b < a) a = b; return a; }
template<class A, class B> A&& maxi(A &&a, B &&b) { if (b > a) a = b; return a; }
int first_bit(int x) { return x == 0 ? 0 : sizeof(x) * 8 - __builtin_clz(x); }
int ceil2(int x) { return x < 2 ? x : 1 << first_bit(x - 1); }
constexpr int inf = 0x3f3f3f3f;
constexpr long long inf_l = 0x3f3f3f3f3f3f3f3f;

#define _eif(a...) typename enable_if<a, int>::type()
#define _func(func, a...) template<class T> auto func(T &&x) -> decltype(a)
#define _rref(a...) typename remove_reference<a>::type
#define _create_trait(name, a...) \
    _func(_##name, a, true_type{}); \
    false_type _##name(...); \
    template<class T> struct name : decltype(_##name(declval<T>())) {};
struct Debug;
_create_trait(is_debug_func, x(declval<add_lvalue_reference<Debug>::type>()));
_create_trait(is_func, x())
_create_trait(is_string, string(x))
_create_trait(is_ptr, *x, _eif(is_string<T>() == false));
_create_trait(is_container, x.begin(), _eif(is_string<T>() == false))

template<class Iter> struct Off { Iter _a, _b; };
_func(O, _eif(is_container<T>() == true), Off<decltype(x.begin())>()) { return { ALL(x) }; }
_func(O, _eif(is_container<T>() == false), x) { return x; }

#define _operator(a...) _func(operator<<, a, *this)
struct Debug {
    Debug() {  cerr << boolalpha << fixed << setprecision(0); }
    ~Debug() { cerr << nl; }
    Debug& operator()(int x = 1) { REP(_, x) *this << "  "; return *this; }
    _operator(cerr << x, _eif(is_func<T>() == false && is_ptr<T>() == false && is_integral<_rref(T)>() == true)) {
        using L = long long;
        if(abs(int(x)) == inf || abs(L(x)) == inf_l)
            cerr << ((int(x) == inf || L(x) == inf_l) ? "+∞" : (int(x) == -inf || L(x) == -inf_l) ? "-∞" : "?");
        else
            cerr << x;
        return *this;
    }
    _operator(cerr << x, _eif(is_func<T>() == false && is_ptr<T>() == false && is_integral<_rref(T)>() == false)) {
        cerr << x;
        return *this;
    }
    _operator(x.first) {
        return *this << "(" << O(x.first) << ", " << O(x.second) << ")"; }
    _operator(_eif(is_container<T>() == true)) {
        *this << "{\n";
        for (auto a = x.begin(); a != x.end(); ++a)
            *this << "  " << distance(x.begin(), a) << ": " << O(*a) << '\n';
        return *this << "}";
    }
    _operator(x._a) {
        *this << "{";
        for (auto a = x._a, b = x._b; a != b; ++a)
            *this << O(*a) << (next(a) == b ? "" : ", ");
        return *this << "}";
    }
    _operator(_eif(is_func<T>() == true)) { x(); return *this; }
    _operator(_eif(is_debug_func<T>() == true)) { x(*this); return *this; }
    _operator(_eif(is_ptr<T>() == true && is_func<T>() == false && is_debug_func<T>() == false)) {
        return *this << *x;
    }
};
struct DebugOff {
    template<class T> DebugOff& operator<<(T&&) { return *this; }
    DebugOff& operator()(int = 0) { return *this; }
};

#ifdef DEBUG
# define D Debug()
#else
# define D DebugOff()
#endif
#define I(a...) #a ": " << a << "   "

using VI    = V<int>;
using VVI   = V<VI>;
using L     = long long;
using VL    = V<L>;
using VB    = V<bool>;
using II    = pair<int, int>;
using VII   = V<II>;
using VVII  = V<VII>;

// end of templates
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    int t;
    cin >> t;

    unsigned long long Ans = 0;
    string slowo;
    cin >> slowo;
    int n = SZ(slowo);
    REP(i, t - 1)
    {
        string s;
        cin >> s;
        int k = SZ(s);
        //D << I(slowo);
        //D << I(s);
        //D << I(k) << I(n);
        if(k > n)
        {
        	n = k;
            slowo = s;
            D << I(i + 1) << I(slowo);
            continue;
        }
        int rel = 0;    // 0 = "=", 1 = ">", -1 = "<"
        REP(j, k)
        {
            if(slowo[j] < s[j])
            {
                rel = 1;
                break;
            }  
            if(slowo[j] > s[j])
            {
                rel = -1;
                break;
            }
        }
        //D << I(rel);
        if(rel == 1)
        {
            REP(j, k)
                slowo[j] = s[j];
            FOR(j, k, 13)
            	slowo[j] = '0';
            FORD(j, n - 1, max(n - 13, k))
                slowo[j] = '0';
        }
        else if(rel == 0)
        {
            int pos = n;
            bool przenies = 1;
            while(--pos >= k)
            {
                if(slowo[pos] != '9')
                {
                    slowo[pos]++;
                    przenies = 0;
                    break;
                }
                else
                	slowo[pos] = '0';
            }
            if(przenies)
            {
                slowo += '0';
                n++;
            }
        }
        else
        {
            REP(j, k)
                slowo[j] = s[j];
 			FOR(j, k, 13)
            	slowo[j] = '0';
            if(n > k)
                FORD(j, n - 1, max(n - 13, k))
                    slowo[j] = '0';
            slowo += '0';
            n++;
        }
        D << I(i + 1) << I(slowo);
        //D << "Teraz slowo = " << slowo;
   		//D << "Dodaję " << n - k << nl;
        Ans += (n - k);
    }

    return cout << Ans << nl, 0;
}