There are N children in AtCoder Kindergarten. Mr. Evi will arrange the children in a line, then give 1 candy to the first child in the line, 2 candies to the second child, ..., N candies to the N-th child. How many candies will be necessary in total?
N=int(input())
ans=0

for i in range(0,N+1):
    ans+=1
print(ans)

N=int(input())
ans=0

for i in range(0,N+1):
    ans+=i
print(ans)
