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.
Var i : integer;
S : real;
Begin
For i:=1 to 100 do
S:=0;
If i mod 2 = 0 then S := S+ i;
Write (S);
Readln;
End.
program bai1;
var s,i:longint;
begin
s:=0;
for i:=1 to 100 do
if i mod 2=0 then s:=s+i;
write('s= ',s);
readln
end.