\[\boxed{\mathbf{502.}}\]
\[100\ :2 = 50\]
\[26\ :2 = 23\]
\[620\ :2 = 310\]
\[284\ :2 = 142\]
\[120\ :2 = 60\]
\[200\ :2 = 100\]
\[402\ :2 = 201\]
\[68\ :2 = 34\]
\[206\ :2 = 103\]
\[800\ :2 = 400\]