[백준] 1075번 : 나누기 - C#

https://www.acmicpc.net/problem/1075

using System;

class Program
{
    static void Main(string[] args) {
        string s=Console.ReadLine();
        string s1=Console.ReadLine();
        int n=int.Parse(s);
        int f=int.Parse(s1);
        int a=n%100;
        int b=n-a;
        int c=b%f;
        if(c==0) Console.Write("00");
        else Console.Write("{0:D2}",(f-c)%100);
    }
}