import java.util.*;
abstract class atm{
    abstract double display();
}
class deposit extends atm{
    double a;
    int ac;
    deposit(double a,int ac){
        this.a=a;
        this.ac=ac;
    }
    @override
    double display(){
        if(a<0){
            System.out.println("Invalid input");
            return -1;
        }
        else{
            return 1000+a;
        }
    }
}
class with extends atm{
    double r;
    int acc;
    with(double r,int acc){
        this.r=r;
        this.acc=acc;
    }
    @override
    double display(){
        if(r<0){
            System.out.println("Invalid input");
            return -1;
        }
        else{
            return 1000-r;
        }
    }
}
public class Main{ 
    public static void main(String args[]){
        Scanner sc=new Scanner(System.in);
        String type=sc.nextLine().trim();
        atm at= null;
        switch(type){
            case "deposit":
            double a=sc.nextDouble();
            int ac=sc.nextInt();
            at=new deposit(a,ac);
            break;
            case "withdraw":
                double r=sc.nextInt();
                int acc=sc.nextInt();
                at=new with(r,acc);
                break;
                default:
                System.out.println("Invalid input");
                return;
        }
        double r=at.display();
        if(r!=-1){
            System.out.printf("%.1f%n",r);
        }
    }
}