[백준] 1333번 : 부재중 전화 - C++

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

#include <iostream>

using namespace std;

int main() {
    int n,l,d;
    cin>>n>>l>>d;
    l+=5;
    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;
    }
    cout<<time;
}