import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc=new Scanner(System.in);
		int a=sc.nextInt(),b=sc.nextInt(),c=sc.nextInt(),count=0;
		for(int i=a;i<=b;i++){
			if(c%i==0){
				count++;
			}
		}
		System.out.println(count);
	}
}
