Square Root of Integer

Given an integar A.

Compute and return the square root of A.

If A is not a perfect square, return floor(sqrt(A)).

DO NOT USE SQRT FUNCTION FROM STANDARD LIBRARY

Input Format

The first and only argument given is the integer A.

Output Format

Return floor(sqrt(A))

Constraints

1 <= A <= 10^9

For Example

Input 1:
    A = 11
Output 1:
    3

Input 2:
    A = 9
Output 2:
    3

NOTE: You only need to implement the given function. Do not read input, instead use the arguments to the function. Do not print the output, instead return values as specified. Still have a doubt? Checkout Sample Codes for more details.