import java.util.Scanner;

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