import java.util.Scanner;

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