\[\boxed{\mathbf{826}.}\]
\[y = \log_{2}x\]
\[\log_{2}(3) \approx 1,6;\]
\[\log_{2}(0,3) \approx - 1,7;\]
\[\log_{2}(5) \approx 2,3;\]
\[\log_{2}(0,7) \approx - 0,5.\]