import java.util.*;

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