Untitled

 
#include <fstream>
 
using namespace std;
 
long long int l, c, ans;
 
int main(){
 
  ifstream fin("tabela.in");
  ofstream fout("tabela.out");
 
  fin>>l>>c;
  ans=(l-1)^(c-1);
  fout<<ans;
 
  return 0;
}