#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;
    }
    else if (A%2!=0 && 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;
    
    calculateResult(A,B);
    
    return 0
    
}