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 x = 0;
		for(; a <= b; a++){
			if((c % a) == 0) x++;
		}
		System.out.println(x);
	}
}