下面程序的执行结果是什么？

#include<iostream>

using namespace std;

class goods{

private:

     static int totalweight;

     int weight;

public:

     goods(int w){

          weight=w;

          totalweight+=weight;

     }

    goods(goods& gd){

          weight=gd.weight;

          totalweight+=weight;

    }

    ~goods(){

          totalweight-=weight;

    }

    static int gettotal(){

          return totalweight;

    }

};

int goods::totalweight=0;

int main(){

     goods g1(50);

     cout<<goods::gettotal()<<endl;

     goods g2(100);

     cout<<g2.gettotal()<<endl;

return 0;

}