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