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 sum = 0;

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

}