diff --git a/.gitignore b/.gitignore
index 71f62e4..495c2fb 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,3 +4,4 @@
 
 *.swp
 *.swo
+.DS_Store
diff --git a/2021/day9/9a.py b/2021/day9/9a.py
index 23a1a8b..b61b2cc 100644
--- a/2021/day9/9a.py
+++ b/2021/day9/9a.py
@@ -18,4 +18,26 @@ for p in lowList:
 	
 
 print(summa)
-print(lowList)
+explored = []
+
+def explore(x,y):
+	if lines[x][y] == 9 or (x,y) in explored:
+		return 0
+	explored.append((x,y))
+	size = 1
+	if y != 0:
+		size += explore(x,y-1)
+	if y != len(lines[x]) - 1:
+		size += explore(x,y+1)
+	if x != 0:
+		size += explore(x-1,y)
+	if x != len(lines) - 1:
+		size += explore(x+1,y)
+	return size
+
+sizes = [0]*len(lowList)
+for i in range(len(lowList)):
+	sizes[i] = explore(lowList[i][0],lowList[i][1])
+
+sizes.sort()
+print(sizes[-1] * sizes[-2] * sizes[-3])
\ No newline at end of file
diff --git a/README.md b/README.md
index b6730b1..28a344d 100644
--- a/README.md
+++ b/README.md
@@ -1,10 +1,10 @@
 my solutions for the [Advent of Code](https://adventofcode.com/)
 
 in progress:\
-2021 (python)
-2022 (python)
+2021 (python)\
 
 planned:\
+2022 (rust)\
 2020\
 2019\
 2018\