Create Euler1

Euler1

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+// Euler Problem 1 - Multiples of 3 and 5
+//Rextester.Program.Main is the entry point for your code. Don't change it.
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text.RegularExpressions;
+
+namespace Rextester
+{
+    public class Program
+    {
+        public static void Main(string[] args)
+        {
+            //Your code goes here
+            Console.WriteLine(SumMultiples(1000));
+        }
+
+        static int SumMultiples(int max)
+        {
+           var sum = 0;
+
+           for (int i = 1; i * 3 < max; i++)
+           {
+               if ((i * 3) % 5 != 0)
+               {
+                 sum += (i * 3);
+               }
+
+               if (i * 5 < 1000)
+               {
+                  sum += (i * 5);   
+               }               
+           }
+
+           return sum;
+        }
+    }
+}