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+# 2579. Count Total Number of Colored Cells
+
+"""
+there exists an infinitely large two-dimensional grid of uncoloured unit
+cells. you are given a positive integer 'n', indicating that you must do the
+following routine for 'n' minutes: at the first minute, colour any arbitrary
+unit cell blue, and every minute thereafter, colour blue every uncoloured
+cell that touches a blue cell.
+"""
+
+
+class Solution(object):
+ def coloredCells(self, n):
+ """
+ :type n: int
+ :rtype: int
+ """
+ return 1 + 4 * sum(range(n))
+
+
+if __name__ == "__main__":
+ obj = Solution()
+ print(obj.coloredCells(n=1))
+ print(obj.coloredCells(n=2))