while True: try: n=int(input()) a=n**2+1-n#首项a=n^2+1-n res=str(a) for i in range(1,n): a=a+2 res=res+'+'+str(a) print(res) except: break
while True: try: n=int(input()) a=n**2+1-n#首项a=n^2+1-n res=str(a) for i in range(1,n): a=a+2 res=res+'+'+str(a) print(res) except: break