diff --git a/.github/workflows/workflow.yml b/.github/workflows/workflow.yml
new file mode 100644
index 0000000..dcaae06
--- /dev/null
+++ b/.github/workflows/workflow.yml
@@ -0,0 +1,32 @@
+name: main-worklfow
+
+env: {}
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  # Run all unit tests.
+  run-tests:
+    runs-on: ubuntu-latest
+    steps:
+      # Check out the pull request's source code.
+      - name: Check out source code
+        uses: actions/checkout@v3
+
+      # Install Go.
+      - name: Set up Go
+        uses: actions/setup-go@v3
+        with:
+          go-version: "^1.14" # The Go version to download and use.
+      - name: Print Go version
+        run: go version
+
+      # Run unit tests.
+      - name: Run unit tests
+        run: go test -v ./...
diff --git a/foobar/foobar.go b/foobar/foobar.go
index 1416c8e..7fbeb50 100644
--- a/foobar/foobar.go
+++ b/foobar/foobar.go
@@ -18,9 +18,9 @@ func Sequence(length int) ([]string, error) {
 	for i := range seq {
 		n := i + 1
 		switch {
-		case n%3 == 0 && n%5 == 0:
+		case n%3 == 0 && n%7 == 0:
 			seq[i] = "foobar"
-		case n%5 == 0:
+		case n%7 == 0:
 			seq[i] = "bar"
 		case n%3 == 0:
 			seq[i] = "foo"