import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        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);
    }
}
