import java.io.*;
import java.util.*;
import java.math.BigInteger;

public class Solution {

    public static void main(String[] args) {
        Scanner s = new Scanner(System.in);
        int testcases = s.nextInt();  // Number of test cases
        BigInteger sum = BigInteger.ZERO;

        // Summing up all the large numbers
        for (int i = 0; i < testcases; i++) {
            String num = s.next();  // Read the number as a string
            sum = sum.add(new BigInteger(num));  // Add to the sum using BigInteger
        }

        // Convert the sum to a string and print the first 10 digits
        String result = sum.toString();
        System.out.println(result.substring(0, 10));
    }
}