#include <stdio.h>
     
    int main(void) {
    	// your code goes here
    	unsigned long ans, l, n, i;
    	fscanf(stdin, "%d", &l);
    	fscanf(stdin, "%d", &n);
     
    	l -= 3;
     
    	ans = 1;
    	for(i = 0; i < l; i++)
    		ans = ans * 2;
     
    	ans *= n;
     
    	printf("%ld\n", ans);
     
    	return 0;
    }