# Count Total Set Bits - InterviewBit Solution

Problem: Count Total Set Bits

### Problem Description:

Given a positive integer A, the task is to count the total number of set bits in the binary representation of all the numbers from 1 to A
Return the count modulo 109 + 7.

Problem Constraints

`1 <= A <= 109`

Input Format

The first and only argument is an integer A.

Output Format

Return an integer denoting the ( Total number of set bits in the binary representation of all the numbers from 1 to A )modulo 109 + 7.

Example Input

```
Input 1:
A = 3
Input 2:
A = 1
```

Example Output

```
Output 1:
4
Output 2:
1
```

### Example Explanation

Explanation 1:

```
DECIMAL BINARY SET BIT COUNT
1 01 1
2 10 1
3 11 2
1 + 1 + 2 = 4
Answer = 4 % 1000000007 = 4
```

Explanation 2:

```
A = 1
DECIMAL BINARY SET BIT COUNT
1 01 1
Answer = 1 % 1000000007 = 1
```

### Solution Approach:

### Solution in C++:

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