【求助】这段java代码哪里错了？

//用记事本编写程序,求1+2*2+3*3 +...+n*n的值。n的值从键盘输入，
import *;
public class MyApplication3{
    public static void main(String args[])
    {
        int n;
        int sum=0;
        System.out.print("Enter a number please:");
        try{
        n=(int)System.in.read();
        sum=0;
        for(int i=1;i<=n;i++)
            {
            sum=sum+i*i;
            }
        }catch(IOException e){};
                System.out.println("The answer is"+ sum);
    }
}