import java.util.*;

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

