Buggy python submission (verdict: Time Limit Exceeded):
import itertools

def main():
    N, K = map(int, input().split())
    ans = 0
    for a in range(1, N + 1):
        vals = []
        for i in range(a//K + 1, (a + N)//K + 1):
            vals.append(K * i - a)
        ans += len([1 for comb in itertools.product(vals, repeat=2) if (comb[0] + comb[1]) % K == 0])
    print(ans)


if __name__ == '__main__':
    main()


Fixed submission:
def main():
    N, K = map(int, input().split())
    ans = 0
    if K % 2 == 1:
        ans = (N // K) ** 3
    else:
        ans = (N // K) ** 3
        r = K // 2
        ans += len([1 for v in range(1, N+1) if v % K == r]) ** 3
    print(ans)


if __name__ == '__main__':
    main()

Buggy python submission (verdict: Time Limit Exceeded):
def main():
    N, K = map(int, input().split())
    ans = 0
    for a in range(1, N + 1):
        i = (a // K) - 1
        while True:
            i += 1
            b = K * i - a
            if b < a:
                continue
            elif b > N:
                break
            else:
                j = (b // K) - 1
                while True:
                    j += 1
                    c = K * j - b
                    if c < b:
                        continue
                    elif c > N:
                        break
                    elif (a + c) % K == 0:
                        if len(set([a, b, c])) == 1:
                            ans += 1
                        elif len(set([a, b, c])) == 3:
                            ans += 6
                        else:
                            ans += 3
    print(ans)


if __name__ == '__main__':
    main()


Fixed submission:
def main():
    N, K = map(int, input().split())
    ans = 0
    if K % 2 == 1:
        ans = (N // K) ** 3
    else:
        ans = (N // K) ** 3
        r = K // 2
        ans += len([1 for v in range(1, N+1) if v % K == r]) ** 3
    print(ans)


if __name__ == '__main__':
    main()

Buggy python submission (verdict: Time Limit Exceeded):
def main():
    N, K = map(int, input().split())
    ans = 0
    for a in range(1, N + 1):
        i = 0
        while True:
            i += 1
            b = K * i - a
            if b < a:
                continue
            elif b > N:
                break
            else:
                j = 0
                while True:
                    j += 1
                    c = K * j - b
                    if c < b:
                        continue
                    elif c > N:
                        break
                    elif (a + c) % K == 0:
                        if len(set([a, b, c])) == 1:
                            ans += 1
                        elif len(set([a, b, c])) == 3:
                            ans += 6
                        else:
                            ans += 3
    print(ans)


if __name__ == '__main__':
    main()


Fixed submission:
def main():
    N, K = map(int, input().split())
    ans = 0
    if K % 2 == 1:
        ans = (N // K) ** 3
    else:
        ans = (N // K) ** 3
        r = K // 2
        ans += len([1 for v in range(1, N+1) if v % K == r]) ** 3
    print(ans)


if __name__ == '__main__':
    main()