#include<cstdio>
#include<iostream>
using namespace std;
int s=1,n,k;
int main(){
	scanf("%d%d",&n,&k);
	while(n){
		n--;
		s+=min(s,k);
	}
	cout<<s<<endl;
}
### Prompt

Please create a solution in Cpp 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<cstdio>
#include<iostream>
using namespace std;
int s=1,n,k;
int main(){
	scanf("%d%d",&n,&k);
	while(n){
		n--;
		s+=min(s,k);
	}
	cout<<s<<endl;
}
```