void Main()
{
	Console.WriteLine ("Add:		"+Execute(add,3,4));
	Console.WriteLine ("Subtract:	"+Execute(subtract,3,4));
	Console.WriteLine ("Multiply:	"+Execute(multiply,3,4));
}

Func<int,int,int> add = (a,b) => a+b;
Func<int,int,int> subtract = (a,b) => a-b;
Func<int,int,int> multiply = (a,b) => a*b;

public int Execute(Func<int,int,int> del,int a,int b)
{
	return del(a,b);
}