#include <cstdio>
#include <iostream>
#include <algorithm>
#include <vector>
#include <cmath>
#include <map>
#define INF 0x3f3f3f3f
#define $ ios::sync_with_stdio(0);
#define S second
#define F first
#define MAXN 112345
using namespace std;

int lin(int k)
{
    if(k==0)
        return n;
    return 4*lin(k-1)-pow(2,k-1);
}

int main()
{
    int k;
    scanf("%d %d", &n, &k);
    printf("%d\n", 2*lin(k));
}