我弄的通过键盘输入数字,然后显示出其中有多少个负数

#include <iostream>

main()

{
      int amount = 0, val;
      
      while (std::cin >> val)
      
           if (val < 0)
              
              ++amount;
              
      std::cout << << " the amout is : " << amount << std::endl;
     
      system("PAUSE");
      
      return 0;

}

但是输入数据以后不显示结果啊