import java.util.Scanner;

public class Main {

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

}