# Sum of First n number:
# Sum = (s(s+1)) / 2


S = int(input("Enter your NUmber:\n"))
sum  = (S*(S+1)) / 2
while True:
    Natural = [f"Sum of {S} natural number is {sum}"]
    print(Natural)
    break
4e18dd02badafcf5d75ce3b8fbe1a5a70178cf74
<mask token>

<mask token>
while True:
    Natural = [f'Sum of {S} natural number is {sum}']
    print(Natural)
    break

S = int(input('Enter your NUmber:\n'))
sum = S * (S + 1) / 2
while True:
    Natural = [f'Sum of {S} natural number is {sum}']
    print(Natural)
    break

# Sum of First n number:
# Sum = (s(s+1)) / 2


S = int(input("Enter your NUmber:\n"))
sum  = (S*(S+1)) / 2
while True:
    Natural = [f"Sum of {S} natural number is {sum}"]
    print(Natural)
    break