Problem:
Score : 200 points

Problem Statement

Takahashi loves gold coins. He gains 1000 happiness points for each 500-yen coin he has and gains 5 happiness points for each 5-yen coin he has. (Yen is the currency of Japan.)

Takahashi has X yen. If he exchanges his money so that he will gain the most happiness points, how many happiness points will he earn?

(We assume that there are six kinds of coins available: 500-yen, 100-yen, 50-yen, 10-yen, 5-yen, and 1-yen coins.)

Constraints

0 \leq X \leq 10^9

X is an integer.

Input

Input is given from Standard Input in the following format:

X

Output

Print the maximum number of happiness points that can be earned.

Sample Input 1

1024

Sample Output 1

2020

By exchanging his money so that he gets two 500-yen coins and four 5-yen coins, he gains 2020 happiness points, which is the maximum number of happiness points that can be earned.

Sample Input 2

0

Sample Output 2

0

He is penniless - or yenless.

Sample Input 3

1000000000

Sample Output 3

2000000000

He is a billionaire - in yen.

Solution in Java8 (OpenJDK 1.8.0) (judge verdict: Wrong Answer)

//GoldenCoins2.java
import java.util.Scanner;
class Main
{
	public static void main(String args[])
	{
		Scanner sc=new Scanner(System.in);
        int x=sc.nextInt();
        int sum500=0;
        int ans500=0;
        int sum5=0;
        int ans5=0;
        if(x==0){
            System.out.println(0);
        }
        else{
        
        for(int i=1; i<=200000; i++){
            sum500=x-(500*i);
            if(x/500==0){
                ans500=0;
                break;
            }
            ans500++;
            if(sum500<500){
                break;
            }
        }
        //System.out.println(ans500);

        for(int i=1; i<=200000; i++){
            sum5=sum500-(5*i);
            if(sum500/5==0){
                ans5=0;
                break;
            }
            ans5++;
            if(sum5<5){
                break;
            }
        }
        
        //System.out.println(ans5);
        System.out.println((ans500*1000)+(ans5*5));
        }
        sc.close();
    }
}