def calcSumBalance(balance:float,rate:float,numOfBank:int):
	SumBalance = 0
	for i in range(numOfBank):
		SumBalance += balance
		if (i != numOfBank-1):
			balance = (1.0-rate)*balance
	return SumBalance


def main():
	n = int(input())
	r = float(input())
	print(calcSumBalance(100,r,n))

if __name__ == "__main__":
	main()