Calculate Account Balance

You are given a list of transactions. Each transaction consists of three parts: an amount (a positive integer), a type, and a description. The type is either credit or debit. A credit transaction adds the amount to the balance, while a debit transaction subtracts the amount from the balance.

Your task is to calculate the final account balance after processing all the transactions.

Note: The description field is not used in the calculation.

Mathematically, the balance can be expressed as:

[ \text{balance} = \sum_{i=1}^{n} \begin{cases} +,\text{amount}_i & \text{if } \text{type}_i = \texttt{credit}\ -,\text{amount}_i & \text{if } \text{type}_i = \texttt{debit} \end{cases} ]

inputFormat

The input is read from standard input and is formatted as follows:

1. The first line contains a single integer n which indicates the number of transactions.
2. The next n lines each contain a transaction record with three space-separated values: an integer amount, a string type (either credit or debit), and a string description (without spaces).

outputFormat

Output the final account balance as an integer to standard output.

## sample

4
100 credit Deposit
50 debit Withdrawal
200 credit Refund
20 debit Purchase

230

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