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 i=a;i<=b;i++) {
			if(c%i==0) {
				count+=1;
			}
		}
	System.out.println(count);
	}
}

