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#include <iostream>

// ugly ifs :/

using namespace std;

typedef unsigned long long ull;

ull num(string nchars, ull from, ull to);

bool all_nines(string nchars, ull from, ull to);

void set_zeros(string &nchars, ull from, ull to);

void inc(string &nchars, unsigned long end);

int main() {
    ios::sync_with_stdio(false);

    ull n, rest = 0, result = 0;
    string p, a;

    cin >> n;
    while (n--) {
        cin >> a;

        if (a.size() > p.size()) {
            p = a;
            continue;
        }

        if (a.size() < p.size()) {
            ull anum = num(a, 0, a.size());
            ull pnum = num(p, 0, a.size());
            ull zeros = p.size() - a.size();

            if (pnum < anum) {
                result += zeros + rest;

                p = a;
                while (zeros--) {
                    p += "0";
                }

                continue;
            }

            if (anum < pnum) {
                result += zeros + rest + 1;

                p = a;
                while (zeros--) {
                    p += "0";
                }

                if (p.size() == 17) {
                    rest++;
                } else {
                    p += "0";
                }
                continue;
            }

            if (anum == pnum) {
                if (rest == 0) {
                    if (all_nines(p, a.size(), p.size())) {
                        result += zeros + 1;

                        set_zeros(p, a.size(), p.size());

                        if (p.size() == 17) {
                            rest++;
                        } else {
                            p += "0";
                        }
                    } else {
                        result += zeros;
                        inc(p, p.size() - 1);
                    }
                } else {
                    result += zeros + rest;
                }
            }

        }

        // all cases inside done!
        if (a.size() == p.size()) {
            ull anum = num(a, 0, a.size());
            ull pnum = num(p, 0, a.size());

            if (anum > pnum) {
                p = a;
                continue;
            }

            if (anum <= pnum) {
                p = a;
                p += "0";
                result++;
                continue;
            }
        }
    }

    cout << result << endl;

    return 0;
}

void inc(string &nchars, unsigned long end) {
    while (true) {
        if (nchars[end] == '9') {
            nchars[end] = '0';
            end--;
        } else {
            nchars[end]++;
            break;
        }
    }
}

void set_zeros(string &nchars, ull from, ull to) {
    for (ull i = from; i < to; i++) {
        nchars[i] = '0';
    }
}

bool all_nines(string nchars, ull from, ull to) {
    for (ull i = from; i < to; i++) {
        if (nchars[i] != '9') {
            return false;
        }
    }
    return true;
}

ull num(string nchars, ull from, ull to) {
    ull r = 0;
    for (ull i = from; i < to; i++) {
        r = r * 10 + nchars[i] - 48;
    }
    return r;
}