import java.math.BigDecimal;
import java.util.Scanner;
public class Main {
public static void main(String[] args){
Scanner cin=new Scanner(System.in);
BigDecimal sum=new BigDecimal(0);
while(cin.hasNext()){
BigDecimal bg=new BigDecimal(cin.next());
sum=sum.add(bg);
}
System.out.println(sum);
}
}
