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 num = 0;
		for(int i = a; i <= b; i++) {
			if(c % i == 0) {
				num++;
			}
		}
		System.out.println(num);
	}
}
