# Project Euler: Problem 6: Sum square difference
# The sum of the squares of the first ten natural numbers is,
# 1**2 + 2**2 + ... + 10**2 = 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.
# Answer: 25164150


x = y = 0
for i in range(1, 101):
    x += i
    y += i**2
print(x**2 - y)