import java.util.Scanner;

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);
	}
}

