uses crt;

var n,i,t,s:integer;

begin

clrscr;

repeat

readln(n);

until n<>0;

t:=0;

for i:=1 to n do if i mod 2=0 then t:=t+i;

writeln(t);

s:=1;

for i:=1 to n do 

  if i mod 2=1 then s:=s*i;

writeln(s);

readln;

end.

{PROGRAM Bai_tap1;
USES crt;
VAR n, i, C, L:Bytbe;
BEGIN 
  clrscr;
  Write('Nhap n:');Readln(n);
  C:=0;L:=0;
  For i:=1 to n do
    If i mod 2=0 then C:=C+i else L:=L+i;
  writeln('Tong cac so chan la:',C);
  writeln ('Tong cac so le la:',L);
  Readln;
end.  
}

Câu 1: 
uses crt;
var s,i,n:integer;
begin clrscr;
s:=0;
write('Nhap n: ');readln(n);
for i:=1 to n do
if i mod 2 <> 0 then inc(s,i);
write('Tong cac so le tu 1 den ',n,' la: ',s);
readln
end.

Câu 2:
uses crt;
var s,i,n:integer;
begin clrscr;
s:=0;
write('Nhap n: ');readln(n);
for i:=1 to n do
if i mod 2 = 0 then inc(s,i);
write('Tong cac so le tu 1 den ',n,' la: ',s);
readln
end.

Câu 1:

Program HOC24;

var i,p: integer;

t: longint;

begin

write('Nhap P: '); readln(p);

t:=0;

for i:=1 to p do if i mod 2<>0 then t:=t+i;

write('Tong cac so le la: ',t);

readln

end.

Câu 2:

Program HOC24;

var i,n: integer;

t: longint;

begin

write('Nhap N: '); readln(n);

t:=0;

for i:=1 to n do if i mod 2=0 then t:=t+i;

write('Tong cac so chan la: ',t);

readln

end.

Câu 3:

Program HOC24;

var i,t,n: integer;

begin

write('Nhap N: '); readln(n);

t:=0;

for i:=1 to n do if n mod i=0 then t:=t+i;

write('Tong cac uoc cua ',n,' la: ',t);

readln

end.

a)

uses crt;

var i,n:integer;

begin

clrscr;

repeat

write('Nhap n='); readln(n);

until n<100;

if n mod 2=0 then 

begin

for i:=0 to n do 

  if i mod 2=0 then write(i:4);

end

else writeln(n,' khong la so chan');

readln;

end.

b)

uses crt;

var i,n:integer;

begin

clrscr;

repeat

write('Nhap n='); readln(n);

until n<100;

if n mod 2=1 then 

begin

for i:=1 to n do 

  if i mod 2=1 then write(i:4);

end

else writeln(n,' khong la so le');

readln;

end.