dbInya

#include <iostream>
#include <string>
using namespace std;

int main()
{
	int a, b;
	cin >> a >> b;
	if (a >= -100 and a <= 100 and a != 0 and b >= -100 and b <= 100 and b != 0)
	{
		if (b % 2 == 0 and a % 2 != 0)
		{
			cout << b - a;
		}
		else cout << "No";
	}
	else
	{
		cout << "Ne v diapazone";
    }
}