import java.util.Scanner;

public class Main{
    public static void main(String[] args){
	Scanner s = new Scanner(System.in);
	int a = s.nextInt();
	int b = s.nextInt();
	int c = s.nextInt();
	int count = 0;

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

