#include <iostream>
using namespace std;
int main() {
int a,b;
cin>>a;
cin>>b;
if(a%2==0&&b%2==0){
cout<<a;
}else{
}
return 0;
}
I2luY2x1ZGUgPGlvc3RyZWFtPgp1c2luZyBuYW1lc3BhY2Ugc3RkOwoKaW50IG1haW4oKSB7CmludCBhLGI7CmNpbj4+YTsKY2luPj5iOwppZihhJTI9PTAmJmIlMj09MCl7Cgljb3V0PDxhOwp9ZWxzZXsKCQp9CglyZXR1cm4gMDsKfQ==