a=int(input("input"))
for i in range(1,a):
    a=i+a
print(a)

8e87bb5ad07fcf854ef6f8df52e0951114b65442
<mask token>

<mask token>
for i in range(1, a):
    a = i + a
print(a)

a = int(input('input'))
for i in range(1, a):
    a = i + a
print(a)

a=int(input("input"))
for i in range(1,a):
    a=i+a
print(a)
