#include <bits/stdc++.h>
using namespace std;

int Z(int n,int r,int c) {
    if(n==0) return 0;
    int half=1<<(n-1);
    
    if(r<half && c<half) return Z(n-1,r,c);
    else if(r<half && c>=half) return half*half + Z(n-1,r,c-half);
    else if(r>=half && c<half) return half*half* 2 + Z(n-1,r-half,c);
    return half*half*3 +Z(n-1,r-half,c-half);
}

int main() {
    ios::sync_with_stdio(0);
    cin.tie(0);
    int n,r,c;
    cin >> n >> r >> c;
    cout << Z(n,r,c);
    return 0;
}