For a positive integer , let be the sum of all divisors of , so e.g. .

A perfect number, as you probably know, is a number with .

Let us define the perfection quotient of a positive integer as .

Find the sum of all positive integers for which has the form , where is an integer.

**Input Format**

The only line of input contains integer .

**Constraints**

**Output Format**

Print the only line with the answer.

**Sample Input 0**

```
10
```

**Sample Output 0**

```
2
```

**Explanation 0**

The only suitable number from to is .

.

**Sample Input 1**

```
100
```

**Sample Output 1**

```
26
```

**Explanation 1**

is the next suitable number after . There are no other suitable numbers between and .