#include <iostream>
#include <string>
#include <vector>

using namespace std;

int parseInt() {
	string line;
	getline(std::cin, line);

	size_t parsed;
	int const N = stoi(line, &parsed);
	if (parsed != line.size()) {
		cout << "Malformed integer input: " << line << endl;
		exit(1);
	}

	return N;
}

typedef unsigned long long NumberPart; /* 0~2^64-1 */
typedef unsigned char Digit; /* 0~255 */
void accumulate(vector<Digit> &digits, NumberPart part) {
	// Add each digit from part to digits using division by 10
	size_t di = 0;
	bool carry = 0;
	while (part or carry) {
		while (di >= digits.size()) {
			digits.push_back(0);
		}

		Digit const sum = digits[di] + (part % 10) + carry;
		carry = sum / 10;
		digits[di] = sum % 10;

		di++;
		part /= 10;
	}
}

int main(void) {
	int const N = parseInt();

	vector<Digit> digits = { 0 };
	for (int i = 0; i < N; ++i) {
		NumberPart part;
		cin >> part;
		accumulate(digits, part);
	}

	for (int i = digits.size() - 1; i >= 0; --i) {
		cout << to_string(digits[i]);
	}

	cout << endl;

	return 0;
}