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 count=0;

		for (int i = a; i <= b; i++) {
			if(c%i==0){
				count++;
			}
		}
		//c????´???°?????????
		System.out.println(count);
	}
}