#include<bits/stdc++.h>
using namespace std;
ifstream fin("fractal.in");
ofstream fout("fractal.out");
int main(){

    int k, x, y, l, ans=0;

    fin >> k >> x >> y;

    l = (1<<k);

    while(l){

        l = l/2;

        if(x<=l && y<=l){
            /// cadranul 1 (din problema)
            swap(x, y);
            continue;
        }

        if(x<=l && y > l){
            /// cadranul 2
            ans += l*l;
            y = y-l;
            continue;
        }
        if(x>l && y>l){
            /// cadranul 3
            ans += 2*l*l;
            x -= l;
            y -= l;
            continue;
        }

        /// cadranul 4
        ans += 3*l*l;
        x -= l;
        x = l-x+1;
        y = l-y+1;
        swap(x, y);
    }

    fout << ans;

}