백준) 5341번 - python

result =[]

while True:
    mid_result,a = 0, int(input())
    if a==0:
        for i in range(len(result)):
            print(result[i],end='\n')
        break
    else:
        for i in range(1,a+1):
            mid_result += i
        result.append(mid_result)