python please

Page of 3 ZOOM #compute arithmetic series Sn = 1 + 2 + ... +n def main(): # get n n = int(input("Enter torm count n:")) #compute nth term of arithmetic series Sn = arith Series(n) #display nth term of arithmetic series print (n. "th term of arithmetic series=". Sn, sep="") # # Write your arith Series function below # del arith Series(n): Calculate Sn = 1 + 2 + ... +n Parameters: n-term count Return Page