import java.util.Scanner;

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