import java.util.*;

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