CodeChef ATM Problem

 Q. 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

Positive integer 0 < X <= 2000 - the amount of cash which Pooja wishes to withdraw.

Nonnegative number 0<= Y <= 2000 with two digits of precision - Pooja's initial account balance.

Output

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.

Example - Successful Transaction

Input:
30 120.00

Output:
89.50

Example - Incorrect Withdrawal Amount (not multiple of 5)

Input:
42 120.00

Output:
120.00

Example - Insufficient Funds

Input:
300 120.00

Output:
120.00
SOLUTION :- 
#include <iostream>
using namespace std;
int main()
{
    int wit;
    float acc;
    cin>>wit>>acc;
    if (wit%5==0 && wit<=(acc-0.5)) {
        printf("%.2f", acc-wit-0.5);
    }
    else
    printf("%.2f", acc);
    return 0;
}

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