program TinhTongVaUocSo;
var
  a, b, tong, i: integer;
  laSoNguyenTo: boolean;
begin
  write('Nhap a: ');
  readln(a);
  write('Nhap b: ');
  readln(b);
  tong := a + b;
  writeln('Tong cua a va b la: ', tong);
  writeln('Uoc so cua tong la:');
  for i := 1 to tong do
  begin
    if tong mod i = 0 then
      writeln(i);
  end;
  laSoNguyenTo := true;
  if tong < 2 then
    laSoNguyenTo := false
  else
    for i := 2 to trunc(sqrt(tong)) do
      if tong mod i = 0 then
      begin
        laSoNguyenTo := false;
        break;
      end;
  if laSoNguyenTo then
    writeln('Tong a va b la so nguyen to')
  else
    writeln('Tong a va b khong phai la so nguyen to');
  readln;
end.

program TinhTongVaUoc;

var
  a, b, sum, i: integer;
  uoc: boolean;

begin
  write('Nhap so a: ');
  readln(a);

  write('Nhap so b: ');
  readln(b);

  // Tinh tong a+b
  sum := a + b;
  writeln('Tong cua a va b la: ', sum);

  // In ra cac uoc cua tong
  write('Cac uoc cua tong a+b la: ');
  for i := 1 to sum do
  begin
    if sum mod i = 0 then
      write(i, ' ');
  end;
  writeln;

  // Kiem tra xem tong a+b co phai la so hoan hao hay khong
  uoc := false;
  for i := 1 to sum - 1 do
  begin
    if sum mod i = 0 then
      uoc := true;
  end;
  if uoc and (sum = 2 * sum div 2) then
    writeln('Tong a+b la so hoan hao')
  else
    writeln('Tong a+b khong phai la so hoan hao');
end.

var tam,a,b,i:integer;

begin

write('a = ');readln(a);

write('b = ');readln(b);

if a < b then

begin

tam:=a;

a:=b;

b:=tam;

end;

for i:=a to b do

if sqrt(i) = trunc(sqrt(i)) then write(i:10);

readln;

End.

var i,n:integer;

begin

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

i:=2;

while n mod i <> 0 do i:=i+1;

if i = n then write(n,' la so nguyen to')

else write(n,' khong la so nguyen to');

readln

end.

Uses crt;

var i,n,p: integer;

begin clrscr;

readln(n);

for i:=1 to n do if(n mod i=0) then p:=p+1;

if(p=2) then writeln(n,' la so nguyen to')

else writeln(n,' khong phai la so nguyen to');

readln;

end.

Uses crt;

var i,n,z: longint;

begin clrscr;

readln(n); 

z:=1;

while(i<n) do begin 

i:=i+1;

z:=z*i;

end;

writeln(z);

readln;

end.

program TinhGiaiThua;

var n, giaiThua: integer; 

begin
writeln('Nhap vao gia tri cua n (>0): ');
  readln(n);

if n <= 0 then
  begin
    writeln('Gia tri cua n phai lon hon 0.');
    exit; 
  end;

giaiThua := 1; 
  while n > 0 do
  begin
    giaiThua := giaiThua * n;
    n := n - 1;
  end;
  writeln('Giai thua cua n la: ', giaiThua);
   readln;
end.

uses crt;

var i,n,dem:integer;

begin

clrscr;

readln(n);

dem:=0;

i:=1;

while i<=n do

begin

if trunc(sqrt(i))=sqrt(i) then begin inc(dem); write(i:4);

end;

i:=i+1;

end;

writeln;

writeln(dem);

readln;

end.

uses crt;
var a,b,c,ucln,bcnn,i,min:longint;
begin
clrscr;
write('Nhap a='); readln(a);
write('Nhap b='); readln(b);
write('Nhap c='); readln(c);
min:=a;
if min>b then min:=b;
if min>c then min:=c;
ucln:=1;
for i:=1 to min do
if (a mod i=0) and (b mod i=0) and (c mod i=0) then
begin
if ucln<i then ucln:=i;
end;
bcnn:=a*b*c;
for i:=a*b*c downto 1 do
if (i mod a=0) and (i mod b=0) and (i mod c=0) then
begin
if bcnn>i then bcnn:=i;
end;
writeln('Uoc chung lon nhat: ',ucln);
writeln('Boi chung nho nhat: ',bcnn);
readln;
end.

uses crt;

var n,i,dem,dem1:integer;

begin

clrscr;

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

dem:=0;

dem1:=0;

for i:=1 to n do

begin

if i mod 2=0 then inc(dem);

if i mod 2=1 then inc(dem1);

end;

writeln('so luong so chan trong day so tu 1 toi ',n,' la: ',dem);

writeln('so luong so le trong day so tu 1 toi ',n,' la: ',dem1);

readln;

end.

var n,i:longint;

begin

readln(n);

if n mod 2=0 then write('chan: ',n div 2,' le: ',n div 2) else

write('chan: ',n div 2,' le: ',n div 2+1) ;

end.