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#include <iostream>
#include <cstring>

using namespace std;


// #define DEBUG

#ifdef DEBUG
#define PREFIX cerr << __FUNCTION__ << ": "
#define PRINT(x) #x " = " << (x)
#define PRINT1(x)          PREFIX << PRINT(x) << endl
#define PRINT2(x, y)       PREFIX << PRINT(x) << ", " << PRINT(y) << endl
#define PRINT3(x, y, z)    PREFIX << PRINT(x) << ", " << PRINT(y) << ", " << PRINT(z) << endl
#define PRINT4(x, y, z, t) PREFIX << PRINT(x) << ", " << PRINT(y) << ", " << PRINT(z) << ", " << PRINT(t) << endl
#else
#define PRINT1(x)
#define PRINT2(x, y)
#define PRINT3(x, y, z)
#define PRINT4(x, y, z, t)
#endif

struct Number {
	static const int maxLen = 25;
	char bytes[maxLen + 1];
	int length;
	void adjust(const Number &other);
	int diffPos(const Number &other) const;
	bool allNines(int startPos) const;
	void appendZeros(int startPos);
	void copy(const Number &other);
	void addOne();
};

const int Number::maxLen;

istream &operator>>(istream &in, Number &num) {
	in >> num.bytes;
	num.length = strlen(num.bytes);
	return in;
}

ostream &operator<<(ostream &out, const Number &num) {
	out << '(' << num.length << ' ' << num.bytes << ')';
	return out;
}

int Number::diffPos(const Number &other) const {
	for (int i = 0; bytes[i] and other.bytes[i]; ++i) {
		if (bytes[i] != other.bytes[i]) return i;
	}
	return -1;
}

bool Number::allNines(int startPos) const {
	for (int i = startPos; bytes[i]; ++i) {
		if (bytes[i] != '9') return false;
	}
	return true;
}

void Number::appendZeros(int howMany) {
	PRINT2(*this, howMany);
	for (int i = length; i < min(maxLen, length + howMany); ++i) {
		bytes[i] = '0';
		bytes[i + 1] = '\0';
	}
	length += howMany;

}

void Number::copy(const Number &other) {
	int i = length;
	for (; other.bytes[i]; ++i) {
		bytes[i] = other.bytes[i];
	}
	bytes[i] = '\0';
	length = other.length;
}

void Number::addOne() { // assumption: not all digits are nine
	for (int i = length - 1;; --i) {
		if (bytes[i] != 9) {
			++bytes[i];
			return;
		} else {
			bytes[i] = 0;
		}
	}
}

void Number::adjust(const Number &other) {
	PRINT2(*this, other);
	if (other.length < length) return;
	int diff = diffPos(other);
	PRINT1(diff);
	if (other.length == length) {
		if (diff == -1) { // equal, append zero
			appendZeros(1);
			return;
		}
		if (other.bytes[diff] < bytes[diff]) return; // I am greater, done
		appendZeros(1); // I am smaller, append zero
	}
	if (other.length > length) {
		if (diff == -1) { // equal prefixes
			if (other.allNines(length)) {
				appendZeros(other.length - length + 1);
			} else {
				copy(other);
				addOne();
			}
		} else {
			if (other.bytes[diff] < bytes[diff]) {
				appendZeros(other.length - length);
			} else {
				appendZeros(other.length - length + 1);
			}
		}
	}
}


int main() {
	int n;
	long long total = 0;
	Number numbers[2];
	cin >> n;
	cin >> numbers[0];
	for (int i = 1; i < n; ++i) {
		int current = i & 1;
		cin >> numbers[current];
		int len = numbers[current].length;
		numbers[current].adjust(numbers[1 - current]);
		total += numbers[current].length - len;
		PRINT3(i, numbers[current], total);
	}
	cout << total << endl;
}