import java.util.Scanner;


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