CodeChef - ATM

ATM problem from CodeChef.

CodeChef - ATM


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 X and Y.
X is the amount of cash that Pooja wishes to withdraw.
Y 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.


  • 0 <= X <= 2000 - The amount of cash that pooja wishes to withdraw.
  • 1 <= Y <= 2000 - With two digits of precision - pooja's initial account balance.

Solution in Java:

import java.util.*;

class Solution{
    public static void main(String[] args) throws Exception{
       InputStreamReader i = new InputStreamReader(;
        BufferedReader bf = new BufferedReader(i);
        String[] in = bf.readLine().split(" ");
        float n = Float.parseFloat(in[0]);
        float f = Float.parseFloat(in[1]);
        if(n%5==0 && f>=n+0.5f)