Bob at the Bank

Bob has an account in the Bobby Bank. His current account balance is $W$ rupees. Each month, the office in which Bob works deposits a fixed amount of $X$ rupees to his account. $Y$ rupees is deducted from Bob's account each month as bank charges. Find his final account balance after $Z$ months. Note that the account balance can be negative as well. ### Input - The first line will contain $T