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 ans = 0;

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

		System.out.printf("%d\n",ans);
	}
}


