What grade do you need to get on your final?

Code:
import java.util.Scanner;

import java.lang.String;

public class Main {



    /**

     * @param args the command line arguments

     */

    public static void main(String[] args) {

        Scanner input = new Scanner(System.in);

        int currentgrade;

        String wantedgrade;

        System.out.println("************************");

        System.out.println("******Final Finder******");

        System.out.println("********nevets04********");

        System.out.println("************************");



        System.out.print("What is your current grade?(%): ");

        currentgrade = input.nextInt();

        System.out.print("What grade do you want?(A,B,C,D,F): ");

        wantedgrade = input.next();

        if (wantedgrade.contentEquals("A")){

            int neededgrade = currentgrade*4-450;

            neededgrade = neededgrade - (neededgrade*2);

            System.out.print(neededgrade);

            System.out.println("%");

        }

        else if (wantedgrade.contentEquals("B")){

            int neededgrade = currentgrade*4-400;

            neededgrade = neededgrade - (neededgrade*2);

            System.out.print(neededgrade);

            System.out.println("%");

        }

        else if (wantedgrade.contentEquals("C")){

            int neededgrade = currentgrade*4-400;

            neededgrade = neededgrade - (neededgrade*2);

            System.out.print(neededgrade);

            System.out.println("%");

        }

        else if (wantedgrade.contentEquals("D")){

            int neededgrade = currentgrade*4-400;

            neededgrade = neededgrade - (neededgrade*2);

            System.out.print(neededgrade);

            System.out.println("%");

        }

        else if (wantedgrade.contentEquals("F")){

            int neededgrade = currentgrade*4-400;

            neededgrade = neededgrade - (neededgrade*2);

            System.out.print(neededgrade);

            System.out.println("%");

        }

        else {

            System.out.println("Error");



        }





    }



}