import java.util.Scanner;

class Main{
    public static void main(String[] args){
	final Scanner sc=new Scanner(System.in);
	int a=sc.nextInt();
	int b=sc.nextInt();
	int c=sc.nextInt();
	int count =0;
	for(int i=a;i<=b;i++){
	    if(c%i==0) count++;
	}
	System.out.println(count);
    }
}