
import java.util.Scanner;

public class Main {
public static void main(String[] args) {
	Scanner sc=new Scanner(System.in);
	int x=sc.nextInt();
	int sum=0;
	while(x>=5)
	{
		if(x>=500)
		{
			sum+=1000;
			x=x-500;
		}
		else
		{
			sum+=5;
			x=x-5;
		}
	}
	System.out.println(sum);
}
} import java.util.Scanner; Scanner java.util public class Main {
public static void main(String[] args) {
	Scanner sc=new Scanner(System.in);
	int x=sc.nextInt();
	int sum=0;
	while(x>=5)
	{
		if(x>=500)
		{
			sum+=1000;
			x=x-500;
		}
		else
		{
			sum+=5;
			x=x-5;
		}
	}
	System.out.println(sum);
}
} Main public static void main(String[] args) {
	Scanner sc=new Scanner(System.in);
	int x=sc.nextInt();
	int sum=0;
	while(x>=5)
	{
		if(x>=500)
		{
			sum+=1000;
			x=x-500;
		}
		else
		{
			sum+=5;
			x=x-5;
		}
	}
	System.out.println(sum);
} main {
	Scanner sc=new Scanner(System.in);
	int x=sc.nextInt();
	int sum=0;
	while(x>=5)
	{
		if(x>=500)
		{
			sum+=1000;
			x=x-500;
		}
		else
		{
			sum+=5;
			x=x-5;
		}
	}
	System.out.println(sum);
} Scanner sc=new Scanner(System.in); sc new Scanner(System.in) int x=sc.nextInt(); x sc.nextInt() sc.nextInt sc int sum=0; sum 0 while(x>=5)
	{
		if(x>=500)
		{
			sum+=1000;
			x=x-500;
		}
		else
		{
			sum+=5;
			x=x-5;
		}
	} x>=5 x 5 {
		if(x>=500)
		{
			sum+=1000;
			x=x-500;
		}
		else
		{
			sum+=5;
			x=x-5;
		}
	} if(x>=500)
		{
			sum+=1000;
			x=x-500;
		}
		else
		{
			sum+=5;
			x=x-5;
		} x>=500 x 500 {
			sum+=1000;
			x=x-500;
		} sum+=1000 sum 1000 x=x-500 x x-500 x 500 {
			sum+=5;
			x=x-5;
		} sum+=5 sum 5 x=x-5 x x-5 x 5 System.out.println(sum) System.out.println System.out System System.out sum String[] args args public class Main {
public static void main(String[] args) {
	Scanner sc=new Scanner(System.in);
	int x=sc.nextInt();
	int sum=0;
	while(x>=5)
	{
		if(x>=500)
		{
			sum+=1000;
			x=x-500;
		}
		else
		{
			sum+=5;
			x=x-5;
		}
	}
	System.out.println(sum);
}
} public class Main {
public static void main(String[] args) {
	Scanner sc=new Scanner(System.in);
	int x=sc.nextInt();
	int sum=0;
	while(x>=5)
	{
		if(x>=500)
		{
			sum+=1000;
			x=x-500;
		}
		else
		{
			sum+=5;
			x=x-5;
		}
	}
	System.out.println(sum);
}
} Main

import java.util.Scanner;

public class Main {
public static void main(String[] args) {
	Scanner sc=new Scanner(System.in);
	int x=sc.nextInt();
	int sum=0;
	while(x>=5)
	{
		if(x>=500)
		{
			sum+=1000;
			x=x-500;
		}
		else
		{
			sum+=5;
			x=x-5;
		}
	}
	System.out.println(sum);
}
}
