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

