program tinh_tong;
uses crt;
var i,t:integer;
begin
clrscr;
t:=0;
for i:=1 to 200 do
if i mod 2=0 then t:=t+i;
write(t);
readln;
end.
Program viet_chuong_trinh_tinh_tong;
Uses Crt;
Var i,s:integer;
Begin
Clrscr;
i:=2;
While (i>1) and (i<=200) do
Begin
s:=s+i;
i:=i+2;
End;
Writeln(S);
Readln;
End.
uses crt;
var i,t:integer;
begin
clrscr;
t:=0;
i:=2;
while i<=200 do
begin
t:=t+i;
i:=i+2;
end;
writeln(t);
readln;
end.