import java.util.Scanner;

public class Main {

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