$$25255- \frac{ 25 }{ 2 }$$
$\frac{50485}{2}=25242.5$
$$\frac{50510}{2}-\frac{25}{2}$$
$$\frac{50510-25}{2}$$
$$\frac{50485}{2}$$
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$\frac{5 \cdot 23 \cdot 439}{2} = 25242\frac{1}{2} = 25242.5$