#include<bits/stdc++.h>
using namespace std;
int n,k,a=1;int z;
int main(){
	cin>>n>>k;
	for(int i=1;i<=n;i++){
		if(a>k)a+=k;
		else a+=a;
	}
	cout<<a;
	return 0;
}
### Prompt

Your task is to create a Cpp solution to the following problem:

Square1001 has seen an electric bulletin board displaying the integer 1. He can perform the following operations A and B to change this value:

* Operation A: The displayed value is doubled.
* Operation B: The displayed value increases by K.



Square1001 needs to perform these operations N times in total. Find the minimum possible value displayed in the board after N operations.

Constraints

* 1 \leq N, K \leq 10
* All input values are integers.

Input

Input is given from Standard Input in the following format:


N
K


Output

Print the minimum possible value displayed in the board after N operations.

Examples

Input

4
3


Output

10


Input

10
10


Output

76

### Response

```cpp
#include<bits/stdc++.h>
using namespace std;
int n,k,a=1;int z;
int main(){
	cin>>n>>k;
	for(int i=1;i<=n;i++){
		if(a>k)a+=k;
		else a+=a;
	}
	cout<<a;
	return 0;
}
```