import java.math.*;

public class Example6_6
{  public static void main(String args[])
   {
        
       BigInteger sum=new BigInteger("0"),
                   b=new BigInteger("1");
                    
      
        for(int i=1;i<=30;i++)
             {  
               String q=String.valueOf(i+2);
               BigInteger y=new  BigInteger(q);
               
               
               sum=sum.add(b);
               b=b.multiply(y);
               }
             System.out.println(sum);
     }
}

可能是我的平台把，我是直接复制过来的。是平台，要怎么检查？