begin_time = datetime.datetime.now()
num = int(input())
i=0
s=0
while i<num:
i=i+1
s=s+i
print(s)
begin_time = datetime.datetime.now()
num = int(input())
i=0
s=0
while i<num:
i=i+1
s=s+i
print(s)
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