Problem:
Score : 200 points

Problem Statement

An integer X is called a Harshad number if X is divisible by f(X), where f(X) is the sum of the digits in X when written in base 10.

Given an integer N, determine whether it is a Harshad number.

Constraints

1?N?10^8

N is an integer.

Input

Input is given from Standard Input in the following format:

N

Output

Print Yes if N is a Harshad number; print No otherwise.

Sample Input 1

12

Sample Output 1

Yes

f(12)=1+2=3. Since 12 is divisible by 3, 12 is a Harshad number.

Sample Input 2

57

Sample Output 2

No

f(57)=5+7=12. Since 57 is not divisible by 12, 12 is not a Harshad number.

Sample Input 3

148

Sample Output 3

No

Solution in OCaml (4.02.3) (judge verdict: Accepted)

open Printf
open Scanf

let id x = x

let n = scanf "%d" id

let () =
    let r = ref 0 in
    let s = string_of_int n in
    String.iter (fun c -> r := !r + (int_of_char c - int_of_char '0')) s;
    if n mod !r = 0 then
        print_endline "Yes"
    else
        print_endline "No"