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

class Main {
	public static void main (String[] args) throws IOException {
            Scanner sc = new Scanner(System.in);
            
            int n = sc.nextInt();
            BigDecimal[] nums = new BigDecimal[n];
            for (int i = 0; i < n; i++) {
                nums[i] = new BigDecimal(sc.next());
            }
            
            jout(solve(nums) + "\n");
	}
        
        public static String solve (BigDecimal[] nums) {
            BigDecimal ret = BigDecimal.ZERO;
            for (BigDecimal num : nums) {
                ret = ret.add(num);
            }
            return ret.setScale(10).toPlainString();
        }
        
       	public static void jout (Object o) {
            System.out.print(o);
	}
}