#include <bits/stdc++.h>
using namespace std;

int n;
string a, b;

int main() {

	cin >> n >> a >> b;

	for (int i = n; i >= 0; i--) {
		if (a.substr(n - i) == b.substr(0, i))
			return !printf("%d\n", 2 * n - i);
	}

}
### Prompt

Please create a solution in cpp to the following problem:

Snuke is interested in strings that satisfy the following conditions:

* The length of the string is at least N.
* The first N characters equal to the string s.
* The last N characters equal to the string t.



Find the length of the shortest string that satisfies the conditions.

Constraints

* 1≤N≤100
* The lengths of s and t are both N.
* s and t consist of lowercase English letters.

Input

The input is given from Standard Input in the following format:


N
s
t


Output

Print the length of the shortest string that satisfies the conditions.

Examples

Input

3
abc
cde


Output

5


Input

1
a
z


Output

2


Input

4
expr
expr


Output

4

### Response

```cpp
#include <bits/stdc++.h>
using namespace std;

int n;
string a, b;

int main() {

	cin >> n >> a >> b;

	for (int i = n; i >= 0; i--) {
		if (a.substr(n - i) == b.substr(0, i))
			return !printf("%d\n", 2 * n - i);
	}

}
```