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only use whole number, integer not double or decimal $5.$ PENNIES FOR PAY

Susan is hired for a job, and her employer agrees to pay her every day. Her employer also agrees that Susan's salary is $1$ penny the first day, $2$ pennies the second day, $4$ pennies the third day, continuing to double each day. Create an application that allows the user to enter the number of days that Susan will work and calculates the total amount of pay she will receive over that period of time.