观察题目可得出规律:输入整数m, m的立方等于m x (m - 1) + 1和m x (m + 1)之间的奇数相加。

while True:
    try:
        m = int(input())
        lst = []
        for i in range(m * (m - 1) + 1, m * (m + 1)):
            if i % 2 != 0:
                lst.append(i)
        print('+'.join(map(str, lst)))
    except:
        break