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Problem_001 done in C# #207

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Problem_001 done in C# #207

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21 changes: 21 additions & 0 deletions C#/001.Multiples_of_3_and_5/faisal_afroz.cs
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// Euler Problem_001 by faisal_afroz with O(1) complexity.
using System;

namespace MultiplesOf3and5
{
public class Program
{
public static void Main()
{
int maxNumber=1000;
int x = (maxNumber-1)/3;
int y = (maxNumber-1)/5;
int z = (maxNumber-1)/15;
int sum3 = (3*x*(x+1))/2;
int sum5 = (5*y*(y+1))/2;
int sum15 = (15*z*(z+1))/2;
int sum = sum3 + sum5 - sum15;
Console.WriteLine(sum);
}
}
}