$$F=0+ \sqrt{ (2-1)+(3-1)+(5-1)+(5-2)+(5-3)+(5-4)+(4-2)+(3-2) }$$
$F=4$
$$F=0+\sqrt{1+3-1+5-1+5-2+5-3+5-4+4-2+3-2}$$
$$F=0+\sqrt{4-1+5-1+5-2+5-3+5-4+4-2+3-2}$$
$$F=0+\sqrt{3+5-1+5-2+5-3+5-4+4-2+3-2}$$
$$F=0+\sqrt{8-1+5-2+5-3+5-4+4-2+3-2}$$
$$F=0+\sqrt{7+5-2+5-3+5-4+4-2+3-2}$$
$$F=0+\sqrt{12-2+5-3+5-4+4-2+3-2}$$
$$F=0+\sqrt{10+5-3+5-4+4-2+3-2}$$
$$F=0+\sqrt{15-3+5-4+4-2+3-2}$$
$$F=0+\sqrt{12+5-4+4-2+3-2}$$
$$F=0+\sqrt{17-4+4-2+3-2}$$
$$F=0+\sqrt{13+4-2+3-2}$$
$$F=0+\sqrt{17-2+3-2}$$
$$F=0+\sqrt{15+3-2}$$
$$F=0+\sqrt{18-2}$$
$$F=0+\sqrt{16}$$
$$F=0+4$$
$$F=4$$
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$F≔4$
