import java.util.*;
public class Main
{
public static void main(String[] args) {
Scanner sc  = new Scanner(System.in);
int x = sc.nextInt();
int result =0;
int div=0;

   div = x/500;
    result = div*2*500;



x = x-(div*500);


result+= x;

if(x%5!=0){
result=result- (x%5);


}
System.out.println(result);
}

} import java.util.*; util.* java public class Main
{
public static void main(String[] args) {
Scanner sc  = new Scanner(System.in);
int x = sc.nextInt();
int result =0;
int div=0;

   div = x/500;
    result = div*2*500;



x = x-(div*500);


result+= x;

if(x%5!=0){
result=result- (x%5);


}
System.out.println(result);
}

} Main public static void main(String[] args) {
Scanner sc  = new Scanner(System.in);
int x = sc.nextInt();
int result =0;
int div=0;

   div = x/500;
    result = div*2*500;



x = x-(div*500);


result+= x;

if(x%5!=0){
result=result- (x%5);


}
System.out.println(result);
} main {
Scanner sc  = new Scanner(System.in);
int x = sc.nextInt();
int result =0;
int div=0;

   div = x/500;
    result = div*2*500;



x = x-(div*500);


result+= x;

if(x%5!=0){
result=result- (x%5);


}
System.out.println(result);
} Scanner sc  = new Scanner(System.in); sc new Scanner(System.in) int x = sc.nextInt(); x sc.nextInt() sc.nextInt sc int result =0; result 0 int div=0; div 0 div = x/500 div x/500 x 500 result = div*2*500 result div*2*500 div*2*500 div 2 500 x = x-(div*500) x x-(div*500) x (div*500) div 500 result+= x result x if(x%5!=0){
result=result- (x%5);


} x%5!=0 x%5 x 5 0 {
result=result- (x%5);


} result=result- (x%5) result result- (x%5) result (x%5) x 5 System.out.println(result) System.out.println System.out System System.out result String[] args args public class Main
{
public static void main(String[] args) {
Scanner sc  = new Scanner(System.in);
int x = sc.nextInt();
int result =0;
int div=0;

   div = x/500;
    result = div*2*500;



x = x-(div*500);


result+= x;

if(x%5!=0){
result=result- (x%5);


}
System.out.println(result);
}

} public class Main
{
public static void main(String[] args) {
Scanner sc  = new Scanner(System.in);
int x = sc.nextInt();
int result =0;
int div=0;

   div = x/500;
    result = div*2*500;



x = x-(div*500);


result+= x;

if(x%5!=0){
result=result- (x%5);


}
System.out.println(result);
}

} Main
import java.util.*;
public class Main
{
public static void main(String[] args) {
Scanner sc  = new Scanner(System.in);
int x = sc.nextInt();
int result =0;
int div=0;

   div = x/500;
    result = div*2*500;



x = x-(div*500);


result+= x;

if(x%5!=0){
result=result- (x%5);


}
System.out.println(result);
}

}