#include <stdio.h>
int main(){
    freopen("fractal.in","r",stdin);
    freopen("fractal.out","w",stdout);
    int k,n,m,s=0;
    scanf("%i%i%i",&k,&n,&m);
    while(k--){
        int c=1<<k,d=c*c;
        if(n<=c) {if(m<=c)n^=m^=n^=m; else m-=c,s+=d;}
        else if(m<=c) n=2*c-n+1,m=c-m+1,n^=m^=n^=m,s+=3*d;
        else n-=c,m-=c,s+=2*d;
        }
    printf("%i",s);
    return 0;
    }