ATM Simulation

You are required to simulate a simple ATM system. The ATM supports the following operations:

• DEPOSIT X: Deposits an amount X into the ATM. The amount must be positive. After a successful operation, the ATM's new balance is printed.
• WITHDRAW X: Withdraws an amount X from the ATM. The amount must be positive and not exceed the current balance. After a successful operation, the ATM's new balance is printed.
• CHECK: Outputs the current balance.
• HISTORY: Outputs the total number of successful deposit or withdrawal transactions performed.

For any deposit or withdrawal operation that fails (e.g. depositing a non-positive amount or attempting to withdraw more than the available balance), print the corresponding error message as specified below:

• If the deposit amount is not positive, output: Deposit amount must be greater than zero.
• If the withdrawal amount is not positive, output: Withdrawal amount must be greater than zero.
• If the withdrawal amount exceeds the current balance, output: Insufficient funds.

Initially, the ATM balance is 0.0 and the transaction history is empty.

inputFormat

The input is read from standard input (stdin) in the following format:

1. The first line contains an integer T representing the number of operations.
2. The next T lines each contain one operation. An operation is one of the following:
   • DEPOSIT X where X is a floating-point number.
   • WITHDRAW X where X is a floating-point number.
   • CHECK
   • HISTORY

outputFormat

The output must be printed to standard output (stdout). For each input operation, output a result on a new line as follows:

• For a successful DEPOSIT or WITHDRAW operation, print the new balance (as a floating point number).
• For a CHECK operation, print the current balance.
• For a HISTORY operation, print the count of successful deposit and withdrawal transactions.
• If an error occurs in DEPOSIT or WITHDRAW, print the error message exactly as specified.

## sample

4
CHECK
DEPOSIT 100.0
WITHDRAW 50.0
HISTORY

0.0
100.0
50.0
2

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