import java.util.Scanner;

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