4. 極速穿梭

while (true)
{
    var sb = Console.ReadLine();
    if (sb.Length == 0) break;
    var d = sb.Split(" ");
    var s = int.Parse(d[0]);
    var k = d[1].Split("/");
    int k1 = int.Parse(k[0]);
    int k2 = int.Parse(k[1]);
    var c = double.Parse(d[2]);

    Console.WriteLine((int)Math.Round((double)s * k1 / k2 / c));
}