5 2 4 1 4 3 3 3 5 1 3 4 6 4 5 3 5 5 5 4 6
3999983 3999976 3999982 3999978 3999977 The figure shows the top-left $5 \times 6$ region of the sky.  * When cloud $1$ is removed, the number of cells covered by some cloud is $17$, so the number of cells not covered by any cloud is $3999983$. * When cloud $2$ is removed, the number of cells covered by some cloud is $24$, so the number of cells not covered by any cloud is $3999976$. * When cloud $3$ is removed, the number of cells covered by some cloud is $18$, so the number of cells not covered by any cloud is $3999982$. * When cloud $4$ is removed, the number of cells covered by some cloud is $22$, so the number of cells not covered by any cloud is $3999978$. * When cloud $5$ is removed, the number of cells covered by some cloud is $23$, so the number of cells not covered by any cloud is $3999977$.
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"content": "The sky is represented by a $2000 \\times 2000$ grid. When looking up at the sky, the cell at the $r$\\-th row from the top and $c$\\-th column from the left is called $(r,c)$. Currently, there are clo",
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"content": "The sky is represented by a $2000 \\times 2000$ grid. \nWhen looking up at the sky, the cell at the $r$\\-th row from the top and $c$\\-th column from the left is called $(r,c)$.\nCurrently, there are clo...",
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