begin
ReadInteger('f=').To(11).Aggregate(1, (p, q)-> p * q).Println
end.
21.To(ReadInteger('D=')).Sum.Println
begin
ReadInteger('f=').To(11).Aggregate(1, (p, q)-> p * q).Println
end.
f= 516632002)begin
21.To(ReadInteger('D=')).Sum.Println
end.
D= 561386