# Kelvin Ly
# 10/16/12
# Sums the first N odd integers

def main():
	n = int(input("Enter a positive integer.\n"))

	sum = 0
	for i in range(1,n+1):
		sum = sum + 2*i+1	#The ith odd number.
	
	#The other possible solutions are similar to the ones
	#given on sumeven.py so I feel no need to repeat them.

	print("The sum of the first ", n, " odd integers is ", sum, ".", sep="")

main()