[Init] Solved solutions

cs/158B.cs

@@ -0,0 +1,34 @@
+using System;
+
+namespace problem_158B
+{
+	class problem_158B
+	{
+		static void Main(string[] args)
+		{
+			int n = int.Parse(Console.ReadLine());
+			int[] a = new int[4];
+			int[] ip = Array.ConvertAll(Console.ReadLine().Split(), int.Parse);
+			for (int i = 0; i < n; i++)
+			{
+				a[ip[i] - 1]++;
+			}
+			int c = a[3];
+			c += a[2];
+			a[0] -= a[2];
+            if (a[0] < 0)
+			{
+				a[0] = 0;
+			}
+			c += a[1] / 2;
+			a[1] %= 2;
+			a[0] += 2 * a[1];
+			c += a[0] / 4;
+			if (a[0] % 4 != 0)
+			{
+				c++;
+			}
+			Console.Write(c);
+		}
+	}
+}