Sum of an arithmetic series

 n = int(input("Enter a number: "))


# Using the formula for the sum of an arithmetic series

sum_of_n_numbers = (n * (n + 1)) // 2

print("Sum of the first", n, "numbers is", sum_of_n_numbers)

In this program, we first take the input `n` from the user. Then we use the formula for the sum of an arithmetic series, which is `(n * (n + 1)) // 2`, to calculate the sum of the first `n` numbers. Finally, we print the result.

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