06.WorldSwimmingRecord

//Input
double recordInSeconds = double.Parse(Console.ReadLine());
double metersToSwim = double.Parse(Console.ReadLine());
double secondsForOneMeterSwim = double.Parse(Console.ReadLine());

//Calculations
double swimSecondsWithoutDelay = metersToSwim * secondsForOneMeterSwim;

//int delayTimes = (int)metersToSwim / 15;
double delayTimes = Math.Floor(metersToSwim / 15);
double swimSeconds = swimSecondsWithoutDelay + delayTimes * 12.5;

//Output
if (swimSeconds < recordInSeconds)
{
    Console.WriteLine($"Yes, he succeeded! The new world record is {swimSeconds:f2} seconds.");
}
else
{
    double neededTime = swimSeconds - recordInSeconds;
    Console.WriteLine($"No, he failed! He was {neededTime:f2} seconds slower.");
}