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#include <bits/stdc++.h>

unsigned int min(unsigned int a, unsigned int b) {
    if (a < b)
        return a;
    return b;
}

int compare_string(const std::string& left, const std::string&right) {
    if (left.size() > right.size())
        return 1;
    if (right.size() > left.size())
        return -1;

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

    return 0;
}


int compare_string_on_prefix(const std::string& left, const std::string&right) {

    for (int i = 0; i < min(left.size(), right.size()); i++) {
        if (left[i] > right[i])
            return 1;
        if (left[i] < right[i])
            return -1;
    }

    return 0;
}

std::vector<std::string> read() {
    int n;
    std::cin >> n;
    std::vector<std::string> result(n);
    for (int i = 0; i < n; i++) 
        std::cin >> result[i];

    return result;
}

int add_digits(std::string& a, std::string& b) {
    if (compare_string(a, b) == -1)
        return 0;
    
    int cmp = compare_string_on_prefix(a, b);

    if (cmp == 0) {
        int last = -1;
        int result = 0;
        int old_size = b.size();
        while (a.size() > b.size()) {
            if (a[b.size()] != '9')
                last = b.size(); 
            b.push_back(a[b.size()]);
            result++;
        }
        if (last != -1) {
            b[last]++;
            last++;
            for (int i = last; i < b.size(); i++)
                b[i] = '0';
        }
        else {
            for (int i = old_size; i < b.size(); i++) {
                b[i] = '0';
            }
            b.push_back('0');
            return result + 1;
        }
        return result;
    }
    else if (cmp == -1) {
        int result = a.size() - b.size();
        while (a.size() > b.size()) 
            b.push_back('0');
        return result;
    }
    else {
        int result = a.size() - b.size() + 1;
        while (a.size() > b.size()) 
            b.push_back('0');
        b.push_back('0');
        return result;
    }
}

int solve(std::vector<std::string>& numbers) {
    long long result = 0;
    for (int i = 1; i < numbers.size(); i++) {
        result += add_digits(numbers[i - 1], numbers[i]);
    }
    return result;
}

int main() {
    std::ios_base::sync_with_stdio(false);
    std::vector<std::string> numbers = read();
    std::cout << solve(numbers) << std::endl;
    return 0;
}