#include <cstdio>
#include <cstdint>
using namespace std;

int main()
{
    int64_t a,s=0;
    int k,x,y;
    freopen ("fractal.in","r",stdin);
    freopen ("fractal.out","w",stdout);
    scanf("%d %d %d",&k,&y,&x);
    a=1<<k;
    while(k)
    {
        if(x<=a/2 && y<=a/2)
        {

        }
        else
        if(x>a/2 && y<=a/2)
        {

            s+=1<<(k-1)*2;
        }
        else
        if(x>a/2 && y>a/2)
        {

            s+=2*(1<<(k-1)*2);
        }
        else
        if(x<=a/2 && y>a/2)
        {

            s+=3*(1<<(k-1)*2);
        }
        a>>=1;
        k--;
    }
    printf("%d",s);
    fclose(stdin);
    fclose(stdout);
    return 0;
}