#include <cstdio>

using namespace std;
int k,x,y,d=1;
long long frac(int k, int x, int y)
{
    if(k==2)
    {
        if(x==1&&y==1)
            return 0;
        else if(x==1&&y==2)
            return 3;
        else if(x==2&&y==1)
            return 1;
        else if(x==2&&y==2)
            return 2;
    }
    else
    {
        if(x<=k/2)
        {
            if(y<=k/2)return frac(k/2,y,x);
            else return k/2*k/2*3+frac(k/2,k-y+1,k/2-x+1);
        }
        else
        {
            if(y<=k/2)return k/2*k/2+frac(k/2,x-k/2,y);
            else return k/2*k+frac(k/2,x-k/2,y-k/2);
        }
    }
}
int main()
{
    freopen("fractal.in","r",stdin);
    freopen("fractal.out","w",stdout);
    scanf("%d%d%d",&k,&x,&y);
    d<<=k;
    printf("%lld",frac(d,y,x));
    return 0;
}