题目描述
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.)
Input
Input is given from Standard Input in the following format:
X
Output
Print the maximum number of happiness points that can be earned.
Constraints
- $0 \leq X \leq 10^9$
- X is an integer.
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.
输入格式
见题面 Input 部分
输出格式
见题面 Output 部分