#define _GLIBCXX_FILESYSTEM
#include <bits/stdc++.h>
using namespace std;
ifstream fin("fractal.in");
ofstream fout("fractal.out");
int k, i, j, x, y, sol, n;
int main(){
    fin >> k >> j >> i;
    int t;
    while(k > 0){
        k--;
        t = (1 << k);
        n = t * t;
        if(i <= t && j <= t){
            x = j;
            y = t - i + 1;
            y = t - y + 1;
            i = x;
            j = y;
        }else{
            if(i <= t && j > t){
                j -= t;
                x = t - j + 1;
                y = i;
                y = t - y + 1;
                i = x;
                j = y;
                sol += n * 3;
            }else{
                if(i > t && j <= t){
                    i -= t;
                    sol += n;
                }else{
                    i -= t;
                    j -= t;
                    sol += 2 * n;
                }
            }
        }
    }
    fout << sol;
    return 0;
}