All2

// 1
Comsole.WriteLine("Enter total seconds");
int seconds = int.Parse(Console.ReadLine());
int hour = seconds / 3600;
seconds = seconds % 3600;
int minutes = seconds / 60;
seconds = seconds % 60;
Console.Write(hour);
Console.Write("hours");
Console.Write(minutes);
Console.Write("Minutes");
Console.Write(seconds);
Console.WriteLine("Seconds");

// 2
Console.WriteLine("Enter payment");
int pay = int.Parse(Console.ReadLine());
int ten = pay / 10;
pay = pay % 10;
int five = pay / 5;
pay = pay % 5;
int two = pay / 2;
pay = pay % 2;
int one = pay / 1;
pay = pay % 1;
Console.Write("ten: ");
Console.Write(ten);
Console.Write("five: ");
Console.Write(five);
Console.Write("two: ");
Console.Write(two);
Console.Write("one: ");
Console.WriteLine(one);

// 3
Console.WriteLine("Enter radius");
double r = double.Parse(Console.ReadLine());
Console.WriteLine("Heikef:");
Console.WriteLine(2 * 3.14 * r);
Console.WriteLine("Shetach:");
Console.WriteLine(3.14 * r * r);

// 4
Console.WriteLine("Enter 3 numbers");
double a = double.Parse(Console.ReadLine());
double b = double.Parse(Console.ReadLine());
double c = double.Parse(Console.ReadLine());
Console.WriteLine("Average:");
double d = a + b + c;
Console.WriteLine(d / 3);

// 5
Console.WriteLine("Enter working hours:");
double h = double.Parse(Console.ReadLine());
Console.WriteLine("Enter salary per hour");
double s = double.Parse(Console.ReadLine());
Console.WriteLine("your salary is:");
Console.WriteLine(h * s);

// 6
Console.WriteLine("Enter days");
int days = int.Parse(Console.ReadLine());
int years = days / 365;
days = days % 365;
int months = days / 30;
days = days % 30;
int weeks = days / 7;
days = days % 7;
Console.WriteLine("Years:");
Console.WriteLine(years);
Console.WriteLine("months:");
Console.WriteLine(months);
Console.WriteLine("Weeks:");
Console.WriteLine(Weeks);
Console.WriteLine("Days:");
Console.WriteLine(days);

// 7
Console.WriteLine("Enter nails amount");
int nails = int.Parse(Console.ReadLine());
Console.Write("You need ");
Console.Write(nails / 50);
Console.Write(" Boxes ");
Console.Write("And you have ");
Console.Write(nails % 50);
Console.Write(" extra nails");