from functools import reduce

def product(p, q):
    multi = 0
    while True:
        q.pop(0)
        if not q:
            break
        multi += reduce(lambda x, y: x + y[0] * y[1], zip(p, q), 0)
    return multi

limit = 10000 + 1
print(2 * product(list(range(1, limit)), list(range(1, limit))))