ATM | HS08TEST

Problem

Pooja would like to withdraw X $US from an ATM. The cash machine will only accept the transaction if X is a multiple of 5, and Pooja's account balance has enough cash to perform the withdrawal transaction (including bank charges). For each successful withdrawal the bank charges 0.50 $US.

Calculate Pooja's account balance after an attempted transaction.

Input Format

Each input contains 2 integers $�$ and $�$.
$�$ is the amount of cash which Pooja wishes to withdraw.
$�$ is Pooja's initial account balance.

Output Format

Output the account balance after the attempted transaction, given as a number with two digits of precision. If there is not enough money in the account to complete the transaction, output the current bank balance.

Constraints

1. $0<�\le 2000$ - the amount of cash which Pooja wishes to withdraw.
2. $0\le �\le 2000$ with two digits of precision - Pooja's initial account balance.

Sample 1:

Input

Output

30 120.00

89.50

Explanation:

Example - Successful Transaction

Sample 2:

Input

Output

42 120.00

120.00

Explanation:

Example - Incorrect Withdrawal Amount (not multiple of 5)

Sample 3:

Input

Output

300 120.00

120.00

Explanation:

Example - Insufficient Funds

Solution:

#include <bits/stdc++.h>

using namespace std;

int main()

{

 

    int a;

    float b;

    cin >> a >> b;

    

    if ((a%5==0) && (b-a-0.5>=0))

    {

        cout << fixed << b-a-0.5 << endl;

    }

    else

    {

        cout << fixed << b << endl;

    }

    return 0;

}