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