please solve my java question

Problem #1: (30 pts) Write a program that prompts the user to enter a positive integer number n. The program then calculates the following sum: n+ (2"n) + (3*n) + (4"n) + (5*n) + ... + (n"n). In case the user enters a negative number, the program should output an error message "Invalid Input!" Sample run 1: Enter a positive integer: 4 The sum of the series is 40 Sample run 2 Enter a positive integer: -4 Invalid Input