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

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int N = sc.nextInt();
        BigDecimal sum = new BigDecimal("0.0000000000");
        for(int i=0; i<N; i++){
            BigDecimal num = new BigDecimal(sc.next());
            sum = sum.add(num);
        }
        String ans=sum.toPlainString();
        System.out.println(ans);
    }
}