uses crt;
var i:integer;
s:real;
begin
clrscr;
s:=1;
for i:=1 to 100 do
s:=s*i;
writeln(s:0:0);
readln;
end.
Program viet_chuong_trinh_tinh_tong;
Uses Crt;
Var i,s:integer;
Begin
Clrscr;
i:=2;
While (i>1) and (i<=100) do
Begin
s:=s+i;
i:=i+2;
End;
Writeln(S);
Readln;
End.