29B - Traffic Lights - CodeForces Solution

#include <bits/stdc++.h>
using namespace std;
double l,d,v,g,r;
double t;
int main(){
    scanf("%lf%lf%lf%lf%lf",&l,&d,&v,&g,&r);
    t=d/v;
    while(t>g+r)
	{
		t=t-g-r;
	}
    if(t<g){
        printf("%.8lf\n",l/v);
    }else{
        printf("%.8lf\n",l/v+(g+r-t));
    }
    return 0;
}