知道复利终值求本金

package calculation2;

import java.util.Scanner;

public class calculation3 {

public static void main(String[] args) {
// TODO 自动生成的方法存根
double N=1,money;
Scanner scanner=new Scanner(System.in);
System.out.print("请输入复利终值：");
double sum = scanner.nextDouble();
System.out.print("请输入存钱年数：");
int years = scanner.nextInt();
System.out.print("请输入利率：");
double r = scanner.nextDouble();
for(int i=1;i<=years;i++){
N=(1+r)*N;
}
money=sum/N;
System.out.println("应投入的本金为："+money);
}

}