#include<iostream>
using namespace std;
int main()
{
    int a,b;
    cin>>a;
    cin>>b;
    if(a%2==0&&b%2==0)
    {
        cout<<a*b<<endl;
    }
    if(a%2!=0&&b%!=0)
    {
        cout<<a+b<<endl;
    }
    else
    {
        cout<<"Invalid input"<<endl;
    }
    return 0;
}