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