import java.util.*;
public class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.println("ENTER AMOUNT OF MONEY PRESENT IN ACCOUNT");
double y = sc.nextDouble();
//System.out.println();
System.out.println("ENTER AMOUNT FOR WITHDRAWAL");
int x = sc.nextInt();
if(x%5!=0) {
System.out.println("Enter again");
x = sc.nextInt();
}
double z= y-x-0.50;
if(z>0)
{ System.out.println("REMAINING AMOUNT IS "+ z);
}else{
System.out.println("insufficient funds");
}
}}