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 yaku = 0;

		while(a<b){
			
			//
			if (c % a == 0) {
				yaku++;
			}
			//
			a++;
		}
		System.out.println(yaku);
	}

}

