Problem:
How Many Divisors?

Write a program which reads three integers a, b and c, and prints the number of divisors of c between a and b.

Input

Three integers a, b and c are given in a line separated by a single space.

Output

Print the number of divisors in a line.

Constraints

1 ≤ a, b, c ≤ 10000

a ≤ b

Sample Input 1

5 14 80

Sample Output 1

3

Solution in PHP (judge verdict: Wrong Answer)

<?php
list($a,$b,$c)=explode(' ',trim(fgets(STDIN)));
$d=0;
for($i=$a;$i<=$b;$i++){if(0==$i%$c){++$d;}}
print $d;
?>