题解 | #尼科彻斯定理#

n = int(input())
lifang = n ** 3
for i in range(1, lifang, 2):
    # for j in range(i, i+2*(n-1), 2):
    sum = (i + i + 2 * (n - 1)) / 2 * n
    # print(sum)
    if sum == lifang:

        result = list((range(i, i + 2 * (n - 1) +1, 2)))
        aa = []
        for i in result:
            aa.append(str(i))
        # print(result)
        print('+'.join(aa))
        break