$$6-3 \times 2+4 \times 1-5+13-8/4-9 \times 2/3-1$$
$3$
$$6-6+4\times 1-5+13-\frac{8}{4}-\frac{9\times 2}{3}-1$$
$$0+4\times 1-5+13-\frac{8}{4}-\frac{9\times 2}{3}-1$$
$$0+4-5+13-\frac{8}{4}-\frac{9\times 2}{3}-1$$
$$4-5+13-\frac{8}{4}-\frac{9\times 2}{3}-1$$
$$-1+13-\frac{8}{4}-\frac{9\times 2}{3}-1$$
$$12-\frac{8}{4}-\frac{9\times 2}{3}-1$$
$$12-2-\frac{9\times 2}{3}-1$$
$$10-\frac{9\times 2}{3}-1$$
$$10-\frac{18}{3}-1$$
$$10-6-1$$
$$4-1$$
$$3$$
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