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A number k is called a square number if for some value of d > 1, k % (d*d) = 0.

Given a number **N**, find the total number of positive square numbers less than or equal to N.

**Example 1:**

Input:N =3Output:0Explanation:There are no square numbers which are less than or equal to 3.

**Example 2:**

Input:N =4Output:1Explanation:4 is the only square number less than or equal to 4. 4 is divisible by (2*2).

**Your Task:**

You don't need to read input or print anything. Your task is to complete the function **sqNum()** which takes an Integer N as input and returns the number of square numbers less tha or equal to N.

**Expected Time Complexity:** O(sqrt(N)*log(N) )

**Expected Auxiliary Space:** O(sqrt(N))

**Constraints:**

1 <= N <= 10^{9}

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Square Numbers

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