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