#include<iostream>
using namespace std;
class Number
{
    int n;
    public:
    Number(int num)
    {
        n=num;
    }
    void display()
    {
        cout<<"Negated value:"<<n<<"\n";
    }
    Number operator-()
    {
        Number temp(0);
        temp.n=-n;
        return temp;
    }
    int isValid()
    {
        return(n>=0&&n<=10000);
    }
};
void main()
{
    int input;
    cout<<"Enter a number";
    cin>>input;
    if(input<0||input>10000)
    {
        cout<<"Invalid input";
    }
    else
    {
    Number  num(input);
    Number neg=-num;
    neg.display();
    }
}