In what position brick can fall through the hole? Why program like follows doesn't work properly?

var
 a, b, c, d, e: real;
begin
 readln(a, b, c, d, e);
  if (a<=d)and(b<=e)or
     (a<=e)and(b<=d)or
     (a<=d)and(c<=e)or
     (a<=e)and(c<=d)or
     (b<=d)and(c<=e)or
     (b<=e)and(c<=d) then
    writeln('YES')
  else
    writeln('NO')
end.