diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..3819313
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+*.swp
+*.swo
diff --git a/2021/day3/3b.py b/2021/day3/3b.py
new file mode 100644
index 0000000..0826221
--- /dev/null
+++ b/2021/day3/3b.py
@@ -0,0 +1,37 @@
+lines = open("input.txt", 'r').read().splitlines()
+leng = len(lines)
+bits = len(lines[0])
+
+def fun(bol):
+	targetCandidates = list(range(0,leng))
+	rating = 0
+	target = True
+	for i in range(0, bits):
+		count = 0
+		vacate = []
+		for j in targetCandidates:
+			if len(targetCandidates) == 1:
+				o2 = int(lines[j], 2)
+				break
+			elif i != 0 and bool(int(lines[j][i-1])) != target :
+				vacate.append(j)
+			elif bool(int(lines[j][i])):
+				count += 1
+		targetCandidates = [i for i in targetCandidates if i not in vacate]
+		if count >= len(targetCandidates)/2 and bol:
+			target = True
+		elif count < len(targetCandidates)/2 and not bol:
+			target = True
+		else:
+			target = False
+		if len(targetCandidates) == 2:
+			if bool(int(lines[targetCandidates[0]][i])) == target:
+				return int(lines[targetCandidates[0]], 2)
+			else:
+				return int(lines[targetCandidates[1]], 2)
+		elif len(targetCandidates) == 1:
+			return  int(lines[targetCandidates[0]], 2)
+	
+				
+print(fun(True)*fun(False))
+
diff --git a/2021/day3/input.txt.sample b/2021/day3/input.txt.sample
new file mode 100644
index 0000000..a6366a8
--- /dev/null
+++ b/2021/day3/input.txt.sample
@@ -0,0 +1,12 @@
+00100
+11110
+10110
+10111
+10101
+01111
+00111
+11100
+10000
+11001
+00010
+01010