题解 | #尼科彻斯定理#

import sys



n= int(input())

def StructString(n):
  '''
  首项为    first=n*(n-1)+1
  '''
    first=n*(n-1)+1
    L=[]
    L.append(first)
    next=first
    for i in range(n-1):
        next=next+2
        L.append(next)
    L=list(map(lambda x: str(x),L))
    return "+".join(L)




print(StructString(n))