#include <stdio.h>

int main() {
	int n;
	int m;
	scanf("%d",&n);
	for (m=1;m*m<=n;m++);
	--m;
	printf("%d\n",m*m);
	return 0;
}

### Prompt

Please formulate a cpp solution to the following problem:

Find the largest square number not exceeding N. Here, a square number is an integer that can be represented as the square of an integer.

Constraints

* 1 \leq N \leq 10^9
* N is an integer.

Input

Input is given from Standard Input in the following format:


N


Output

Print the largest square number not exceeding N.

Examples

Input

10


Output

9


Input

81


Output

81


Input

271828182


Output

271821169

### Response

```cpp
#include <stdio.h>

int main() {
	int n;
	int m;
	scanf("%d",&n);
	for (m=1;m*m<=n;m++);
	--m;
	printf("%d\n",m*m);
	return 0;
}

```