#include<iostream>
using namespace std;
void calculateResult(int A,int B)
{
    if (A<0||B<0)
    {
        cout<<"Invalid input";
        return;
    }

    if(A % 2 == 0 && B % 2 == 0)
    {
        cout<<A*B;
    }
    if(A % 2!=0 && B%2 !=0)
    {
        cout<<A+B;
    }
    else
    {
    if(A>B)
        cout<<A-B;
    else
        cout<<B-A;
    }
}
int main()
{
    int A,B;
    cin>>A;
    cin>>B;
    calculate result(A,B);
    return 0;
}