#include <stdio.h>
#include <stdlib.h>

long iN, iT;

int main(void) {
   scanf("%d %d", &iN, &iT);
   if (iT >= 0) {
      printf("%d\n", iT >> (iN-1));
   } else if (iN == 1) {
      printf("%d\n", iT);
   } else {
      printf("%d\n", -(abs(iT) >> (iN-1)) -1);
   }

   return(0);  
}