$$5+4 \frac{ 1 }{ 3 } +3 \frac{ 2 }{ 3 } ............S20$$
$13$
$$5+\frac{12+1}{3}+\frac{3\times 3+2}{3}$$
$$5+\frac{13}{3}+\frac{3\times 3+2}{3}$$
$$\frac{15}{3}+\frac{13}{3}+\frac{3\times 3+2}{3}$$
$$\frac{15+13}{3}+\frac{3\times 3+2}{3}$$
$$\frac{28}{3}+\frac{3\times 3+2}{3}$$
$$\frac{28}{3}+\frac{9+2}{3}$$
$$\frac{28}{3}+\frac{11}{3}$$
$$\frac{28+11}{3}$$
$$\frac{39}{3}$$
$$13$$
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