uses crt;
var m,n,k,s:integer;
begin
clrscr;
repeat
write('Nhap m='); readln(m);
write('Nhap n='); readln(n);
write('Nhap k='); readln(k);
until (m<n) and (n<k) and (m>0) and (n>0) and (k>0);
s:=m*n*k;
if s>=10 then writeln('Tich la so co 2 chu so')
else writeln('Tich khong la so co 2 chu so');
readln;
end.