program prog1;
uses
Crt;
var
sNumber : string;
dNumber : double;
code : integer;
begin
ClrScr;
Write('Chislo = ');
Readln(sNumber);
Write('Otvet : ');
if (Pos('.', sNumber) = 0) or (Pos('e', sNumber) = 0)
then
begin
Write('нет');
Readln;
Exit;
end;
Val(sNumber, dNumber, code);
if (code = 0)
then
Write('да')
else
Write('нет');
Readln;
end.