#include <bits/stdc++.h>
#define p(s) cout<<(s)<<endl
typedef long long ll;
using namespace std;

ll fast_power(ll a, ll b){
	ll ret=1;
	while(b>0){
		if(b & 1){
			ret*=a;
		}
		a*=a;
		b >>= 1;
	}
	return ret;
}

int main(){
	ll L, N;
	cin>>L>>N;
	p(fast_power(2,L-3)*N);
	return 0;
}