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

public class Exercise147{
  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);
    }
    System.out.println(sum.toPlainString());
  }
}