Program HOC24;
var a,b: integer;
function hieu(x,y: integer): integer;
var kq : integer;
begin
kq:=0;
kq:=x;
kq:=kq-y;
hieu:=kq;
end;
begin
write('Nhap so dau tien : '); readln(a);
write('Nhap so thu hai : '); readln(b);
write('Hieu hai so nguyen la : ',hieu(a,b));
readln
end.