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- All Contests
- ProjectEuler+
- Project Euler #73: Counting fractions in a range

# Project Euler #73: Counting fractions in a range

# Project Euler #73: Counting fractions in a range

Contest ends in

_{This problem is a programming version of Problem 73 from projecteuler.net}

Consider the fraction, , where and are positive integers. If and , it is called a reduced proper fraction.

If we list the set of reduced proper fractions for in ascending order of size, we get:

It can be seen that there are 3 fractions between 1/3 and 1/2.

How many fractions lie between and in the sorted set of reduced proper fractions with denominator less than or equal to ?

**Input Format**

The only line of input contains and .

**Constraints**

**Output Format**

Output required number of fractions.

**Sample Input**

```
2 8
```

**Sample Output**

```
3
```