#include<stdio.h>

int sol;

void rez(int x,int y,int k)
{
    if(k==0)
        return;
    int m=k/2;
    if(x<=m&&y<=m)
        rez(y,x,k/2);
    else if(x>m&&y<=m)
        sol+=m*m,rez(x-m,y,k/2);
    else if(x>m&&y>m)
        sol+=2*m*m,rez(x-m,y-m,k/2);
    else sol+=3*m*m,rez(2*m-y+1,m-x+1,k/2);
}

int main()
{
    freopen("fractal.in","r",stdin);
    freopen("fractal.out","w",stdout);
    int k,x,y;
    scanf("%d%d%d",&k,&x,&y);
    rez(y,x,1<<k);
    printf("%d\n",sol);
    return 0;
}