#include <stdio.h>
#include <math.h>

int main(void) {

        int l;
        int n;
        int res;

        scanf("%d",&l);
        scanf("%d",&n);

        //res = (l-3)**n * n;
        res = pow(2,l-3)*n;

        printf("%d\n", res);
        //printf(\n);
        return 0;
}