uses crt;
var n:integer;
begin
clrscr;
writeln('nhap vao mot so bat ki la');readln(n);
if n>0 then writeln('day la so duong')
else writeln('day la so am');readln;end.
uses crt;
var n:integer;
begin
clrscr;
repeat
writeln('nhap vao mot so bat ki la');readln(n);
until n<>0;
if n>0 then writeln('day la so duong')
else writeln('day la so am');readln;end.