import java.util.Scanner;

public class Main {

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

}
