__author__ = 'williamsb'

# Find the difference between the sum of the squares of the first one hundred natural numbers and the square of the sum.

sum1 = 0
sum2 = 0

for i in range(1, 101):
    sum1 += i*i

for i in range(1, 101):
    sum2 += i

sum2 = sum2 * sum2

print sum2 - sum1