/*#include<iostream>
#include<fstream>
#include<queue>
#include<vector>
#define N  (int)1e5+5
using namespace std;
int n,m,p,k,ind[N],sub[N],indeg[N];
int match[N];
vector<int> G[N];
void read()
{
    //ifstream fin("marvel.in");
    freopen("marvel.in","r",stdin);
    scanf("%d%d%d%d",&n,&m,&p,&k);
    for(int i=1;i<=n;++i)
        scanf("%d",&ind[i]);
    for(int i=1;i<=k;++i)
        scanf("%d",&sub[i]);
    for(int i=0;i<m;++i){
        int x,y;
        scanf("%d%d",&x,&y);
        G[x].push_back(y);
        ++indeg[y];
    }
    //fin.close();
}

void bfs()
{
    queue<int> q;
    q.push(1);
    while(!q.empty())
    {
        int curr = q.front();
        q.pop();
        int pos = match[curr];
        if(sub[pos+1]==ind[curr])
            ++match[curr];
        for(auto& i:G[curr])
        {
            match[i]=max(match[i],match[curr]);
            --indeg[i];
            if(!indeg[i])
                q.push(i);
        }
    }
}

void solve()
{
    freopen("marvel.out","w",stdout);
    vector<int> ans;
    for(int i=1;i<=n;++i)
        if(match[i]==k)
            ans.emplace_back(i);
    cout<<ans.size()<<'\n';
    for(auto& i:ans)
        cout<<i<<' ';
}


int main()
{
    read();
    bfs();
    solve();
    return 0;
}*/

//cmap
/*#include<bits/stdc++.h>
#define pii pair<int,int>
#define ll long long
#define mp make_pair
using namespace std;

ll solve(const int& n,vector<pii>& pct)
{
    sort(pct.begin(),pct.end());
    set<pii> s;
    //cout<<pct[0].first<<' '<<pct[0].second<<'\n';
    int j=0;
    ll dc=1e18;
    for(int i=0;i<n;++i)
    {

        int d = ceil(sqrt(dc));
        while(pct[i].first-pct[j].first>=d){
            pii ds=mp(pct[j].second,pct[j].first);
            s.erase(ds);
            ++j;
        }

        set<pii>::iterator jos = s.lower_bound(mp(pct[i].second-d,pct[i].first));
        set<pii>::iterator sus = s.lower_bound(mp(pct[i].second+d,pct[i].first));

        for(auto& it=jos;it!=sus;++it)
        {
            int dx=pct[i].first-it->second;
            int dy=pct[i].second-it->first;
            dc=min(dc,1ll*dx*dx+1ll*dy*dy);
        }

        s.insert(mp(pct[i].second,pct[i].first));
    }
    return dc;
}

int main()
{
    ifstream fin("cmap.in");
    ofstream fout("cmap.out");
    int n;
    fin>>n;
    vector<pii> p(n);
    for(int i=0;i<n;++i)
        fin>>p[i].first>>p[i].second;
    fout<<fixed<<setprecision(6)<<sqrt(solve(n,p));
    fin.close();
    fout.close();
}*/

#include<iostream>
#include<fstream>
using namespace std;
ifstream fin("fractal.in");
ofstream fout("fractal.out");

int solve(int k,int x,int y) {
    if (k == 0)
        return 0;
    int latura = 1 << (k-1);
    if (x <= latura && y <= latura)
        return solve(k - 1, y, x);
    if (x > latura && y <= latura)
        return latura * latura + solve(k - 1, x - latura, y);
    if (x <= latura && y > latura)
        return latura * latura * 3 + solve(k - 1, 2*latura-y+1, latura-x+1);
    else
        return latura * latura * 2 + solve(k - 1, x - latura, y - latura);
}


int main()
{
    int k,x,y;
    fin>>k>>y>>x;
    fout<<solve(k,x,y);
}