Day03 Part 1

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diff --git a/day03/input b/day03/input
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+325489
diff --git a/day03/part1 b/day03/part1
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+#!/usr/bin/env ruby
+
+input = gets.chomp.to_i
+
+n = 0
+n += 1 while ((n*2)+1)**2 < input
+
+s = ((n*2)+1)**2
+
+d = s
+d -= n
+d -= 2*n while d > input
+d += 2*n
+
+if d - n <= input then
+  puts d - input + n
+else
+  puts input - (d - 2*n) + n
+end