Codechef•Sep 21, 2025

ATM

Hazrat Ali

Codechef

Pooja would like to withdraw X US Dollar 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 Dollar.

Calculate Pooja's account balance after an attempted transaction.

Input Format

Each input contains 2 numbers X and Y.
X is the amount of cash which 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.

Constraints

  • 0 - the amount of cash which Pooja wishes to withdraw.
  • 0 with two digits of precision - Pooja's initial account balance.

Sample 1:

Input 
30 120.00
Output
 
89.50

Solution

x, y = input().split()
x = int(x)         
y = float(y)        

if x % 5 == 0 and x + 0.50 <= y:
    y -= (x + 0.50)

print(f"{y:.2f}")

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