# Primes

Time Limit: 1000MS

Memory Limit: 65536K

## Description

A pretty straight forward task, calculate the number of primes between 2 integers. Given 2 integers A ≤ B < 105 what’s the number of primes in range from A to B inclusive. Note: A prime number is a positive integer greater than 1 and is divisible by 1 and itself only. For N to be prime it is enough to test the divisibility of numbers less than or equal to square root of N.

## Input

As many as 1000 lines, each line contains 2 integers A and B separated by a space. Input is terminated when A = B = -1 (Do not process this line).

## Output

For every line in input – except for the last line where A = B = -1 - print the number of prime numbers between A and B inclusive.

## Sample Input

0 9999
1 5
-1 -1

## Sample Output

1229
3

## Source

Seventh ACM Egyptian National Programming Con