$$\frac{ 4 }{ 257 \times 4/4/4/4/4/4/4/40.25 }$$
$\frac{164864}{257}\approx 641.494163424$
$$\frac{4\times 40.25}{\frac{\frac{\frac{\frac{\frac{\frac{257\times 4}{4}}{4}}{4}}{4}}{4}}{4}}$$
$$\frac{161}{\frac{\frac{\frac{\frac{\frac{\frac{257\times 4}{4}}{4}}{4}}{4}}{4}}{4}}$$
$$\frac{161}{\frac{\frac{\frac{\frac{\frac{257\times 4}{4}}{4}}{4}}{4}}{4\times 4}}$$
$$\frac{161}{\frac{\frac{\frac{\frac{257\times 4}{4}}{4}}{4\times 4}}{4\times 4}}$$
$$\frac{161}{\frac{\frac{\frac{257\times 4}{4\times 4}}{4\times 4}}{4\times 4}}$$
$$\frac{161}{\frac{\frac{\frac{257}{4}}{4\times 4}}{4\times 4}}$$
$$\frac{161}{\frac{\frac{\frac{257}{4}}{16}}{4\times 4}}$$
$$\frac{161}{\frac{\frac{257}{4\times 16}}{4\times 4}}$$
$$\frac{161}{\frac{\frac{257}{64}}{4\times 4}}$$
$$\frac{161}{\frac{\frac{257}{64}}{16}}$$
$$\frac{161}{\frac{257}{64\times 16}}$$
$$\frac{161}{\frac{257}{1024}}$$
$$161\times \frac{1024}{257}$$
$$\frac{161\times 1024}{257}$$
$$\frac{164864}{257}$$
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$\frac{7 \cdot 23 \cdot 2 ^ {10}}{257} = 641\frac{127}{257} = 641.4941634241245$
