题目本身比较简单，注意多组数据输入即可

encoding:utf-8

if name == 'main':
while True:
try:
s = input()
y = s*s

        if s%2 == 0:
            z = s*s-s+1   #第一个数
        else:
            z = s*s-s+1
        i = 1
        stri = '' + str(z)
        while i<s:

            z=z+2
            i=i +1
            stri = stri + '+' + str(z)
        print stri
    except:
        break