[백준] 1333번 : 부재중 전화 - C#

https://www.acmicpc.net/problem/1333

using System;

class Program
{
    static void Main() {
        string[] s=Console.ReadLine().Split(' ');
        int n=int.Parse(s[0]);
        int l=int.Parse(s[1])+5;
        int d=int.Parse(s[2]);
        int num=0;
        int time=d;
        for(int i=0;i<n;i++){
            num+=l;
            for(;;){
                if(time<num-5) time+=d;
                else break;
            }
            if(num-5<=time&&time<num) break;
        }
        Console.Write(time);
    }
}