public static void Main(string[] args)
{
Console.WriteLine("Enter a mathematical expression for the differential equation");
Expression slopeExpression = new Expression(Parser.ParseExpression(In.GetString(), null), new ExpressionParser.Parsing.Environment());
Console.WriteLine("Enter an initial point in the form: x,y");
Point initialCondition = GetPoint();
Console.WriteLine("Enter a value to estimate");
double toEstimate = In.GetDouble();
Console.WriteLine("Get the number of steps to calculate, or enter -1 if you want the best approximation");
int steps = In.GetInt();
Console.WriteLine($"Estimated value is : {Estimate(slopeExpression, initialCondition, toEstimate, steps)}");
}