BitF

#include <iostream>
#include <fstream>

using namespace std;

int main() {
    ifstream fin("input.txt");
    ofstream fout("output.txt");

    int a, n;
    fin >> a >> n;
    fout << ((1 << n) ^ a) << endl;

    fin.close();
    fout.close();
    return 0;
}