#include <stdio.h>
int v[5],aux[5];
int main()
{
    int k,x,y,l1,c1,l2,c2,z,i;
    long long nr=0;
    freopen("fractal.in","r",stdin);
    freopen("fractal.out","w",stdout);
    scanf("%d%d%d",&k,&y,&x);
    v[1]=1;
    v[2]=2;
    v[3]=3;
    v[4]=4;
    l1=1;
    c1=1;
    l2=1<<k;
    c2=1<<k;
    nr=0;
    while(k)
    {
        if((l1+l2)/2>=x && (c1+c2)/2>=y) z=1;
        if((l1+l2)/2<x && (c1+c2)/2>=y) z=2;
        if((l1+l2)/2<x && (c1+c2)/2<y) z=3;
        if((l1+l2)/2>=x && (c1+c2)/2<y) z=4;
        if(z==1) l2=(l1+l2)/2,c2=(c1+c2)/2;
        if(z==2) l1=(l1+l2)/2+1,c2=(c1+c2)/2;
        if(z==3) l1=(l1+l2)/2+1,c1=(c1+c2)/2+1;
        if(z==4) l2=(l1+l2)/2,c1=(c1+c2)/2+1;
        for(i=1; i<=4 && v[i]!=z; i++);
        nr+=(long long)(i-1)*(1<<(k-1))*(1<<(k-1));
        switch(z)
        {
            case 1: aux[1]=v[1]; aux[2]=v[4]; aux[3]=v[3]; aux[4]=v[2]; break;
            case 2: aux[1]=v[1]; aux[2]=v[2]; aux[3]=v[3]; aux[4]=v[4]; break;
            case 3: aux[1]=v[1]; aux[2]=v[2]; aux[3]=v[3]; aux[4]=v[4]; break;
            case 4: aux[1]=v[3]; aux[2]=v[2]; aux[3]=v[1]; aux[4]=v[4]; break;
        }
        for(i=1; i<=4; i++)
            v[i]=aux[i],aux[i]=0;
        k--;
    }
    printf("%lld\n",nr);

    return 0;
}