# This program finds the sum of squares of first n postive integers,
# where n is inputed by the user.


def main():
    print "This program finds the sum of squares of first n postive integers,",
    print "where n is inputed by the user."

    number=raw_input("Please input any positive integer and press Enter:")
    
    answer=sumOfSquares(number)

    print "The sum of squares of first",number,"positive integers is",answer
    

# Finds the sum of squares of first n postive integers
# raises Errors if the n value is not a positive integer
# otherwise, returns the sum
def sumOfSquares(n):
    if not n.isdigit():
        raise TypeError('sumOfSquares(n): n must be an integer value')
    n=int(n)
    if n < 1:
        raise ValueError('sumOfSquares(n): n must be positive')

    sq = 0

    for k in range(n+1):
        sq += k*k
    return sq

main()