diff --git a/.gitignore b/.gitignore
index b903888..0fb3e99 100644
--- a/.gitignore
+++ b/.gitignore
@@ -54,4 +54,5 @@ dkms.conf
 
 *.zip
 *.pdf
-*.png
+*.bmp
+!main*
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..dfe8f0a
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,13 @@
+build:
+	gcc main.c bitmap.c -o main -O3
+
+run:
+	make build
+	./main
+
+show:
+	make run
+	feh after.bmp
+
+convert:
+	magick after.bmp after.png # for showing image in pdf
diff --git a/exercise0/Makefile b/exercise0/Makefile
index dfe8f0a..bb69e69 100644
--- a/exercise0/Makefile
+++ b/exercise0/Makefile
@@ -1,13 +1 @@
-build:
-	gcc main.c bitmap.c -o main -O3
-
-run:
-	make build
-	./main
-
-show:
-	make run
-	feh after.bmp
-
-convert:
-	magick after.bmp after.png # for showing image in pdf
+include ../Makefile
diff --git a/exercise0/after.png b/exercise0/after.png
new file mode 100644
index 0000000..66c2d43
Binary files /dev/null and b/exercise0/after.png differ
diff --git a/exercise0/main.pdf b/exercise0/main.pdf
new file mode 100644
index 0000000..153f63b
Binary files /dev/null and b/exercise0/main.pdf differ
diff --git a/flake.nix b/flake.nix
index 4f17079..7180502 100644
--- a/flake.nix
+++ b/flake.nix
@@ -16,8 +16,12 @@
         buildInputs = with pkgs; [
           gcc
           gnumake
-          mpi
           feh
+          imagemagick_light
+          typst
+          typstyle
+          zip
+          unzip
         ];
         shellHook = ''
           echo welcome!