#include<iostream>
using namespace std;
int main(){
    int x,y, temp=0;
    do{
        cout<<"Nhap x : ";
        cin>>x;
        cout<<"Nhap y : ";
        cin>>y;
    }while (x<=1 || y>=1000);
    temp = x;
    x = y;
    y = temp;
   
    cout<<"\nSau khi hoan doi : \n";
    cout<<"x = "<<x<<"\ny = "<<y<<endl;
    system("pause");
}