# Sum square difference
# The sum of the squares of the first ten natural numbers is,
# 12 + 22 + ... + 102 = 385
# The square of the sum of the first ten natural numbers is,
# (1 + 2 + ... + 10)2 = 552 = 3025
# Hence the difference between the sum of the squares of the first ten natural numbers and the square of the sum is 3025 385 = 2640.
# Find the difference between the sum of the squares of the first one hundred natural numbers and the square of the sum.
x = raw_input('Enter your choice for n natural number?: ')
y = int(x)
squaresum = (y*(y+1)*(2*y+1))/6
sum = (y*(y+1)/2)*(y*(y+1)/2)
print sum - squaresum

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