#include<iostream>
#include<math.h>
using namespace std;
int main(){
	int n,i;
	int dao=0;
	do{
		cout<<"nhap n lon hon 0 ";
		cin>>n;
	}while(n < 0);
	do{
		i =n % 10;
		dao=dao*10+i;
	}while( n/=10 );
	if( dao == n )
	{
		cout<<dao<<"so nghich";
	}
	else
	{
		cout<<"khong phai so nghich";
	}
	return 0;
}
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