Day i do not know

231. Power of Two/231. Power of Two.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net6.0</TargetFramework>
+    <RootNamespace>_231._Power_of_Two</RootNamespace>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

231. Power of Two/Program.cs

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+namespace _231._Power_of_Two;
+
+internal class Program
+{
+    static void Main(string[] args)
+    {
+        Console.WriteLine(new Solution().IsPowerOfTwo(int.Parse(Console.ReadLine()!)));
+    }
+}

231. Power of Two/Solution.cs

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+namespace _231._Power_of_Two;
+
+public class Solution
+{
+    public bool IsPowerOfTwo(int n)
+    {
+        double log = Math.Log(n, 2);
+        return Math.Round(log, 12) == (int)log;
+    }
+}