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 j = 0;

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