n = int(input())

def nk_fst(n):
    res = [1]
    for i in range(1, n):
        dif = 2*i
        num = res[i-1] + dif
        res.append(num)
    return res[-1]

nums = [nk_fst(n)]

for i in range(1, n):
    num = nums[i-1] + 2
    nums.append(num)

nums = map(str, nums)

print('+'.join(nums))