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 d=0;
		for(int i=a;i<=b;i++) {
			if(c%i==0) {
				d+=1;
			}

		}
		System.out.println(d);

	}

}

