题解 | #尼科彻斯定理#

while True:
    try:
        m = int(input())
        a = []
        for i in range(m * (m - 1) + 1, m * (m + 1), 2):
            a.append(i)
        for i in a:
            if i == a[-1]:
                print(i)
            else:
                print(i, end="+")
    except:
        break