diff --git a/2025/day01/go.mod b/2025/day01/go.mod
new file mode 100644
index 0000000..03f29ac
--- /dev/null
+++ b/2025/day01/go.mod
@@ -0,0 +1,3 @@
+module tangled.org/seth.computer/advent-of-code/2025/day01
+
+go 1.25.7
diff --git a/2025/day01/input.txt b/2025/day01/input.txt
new file mode 100644
index 0000000..9d0b4ed
--- /dev/null
+++ b/2025/day01/input.txt
@@ -0,0 +1,4081 @@
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diff --git a/2025/day01/main.go b/2025/day01/main.go
new file mode 100644
index 0000000..a12796a
--- /dev/null
+++ b/2025/day01/main.go
@@ -0,0 +1,95 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"log"
+	"os"
+	"strconv"
+)
+
+func main() {
+	inputf, err := os.Open("input.txt")
+	if err != nil {
+		log.Fatalf("failed to open file: %v", err)
+	}
+	defer inputf.Close()
+
+	// starting position
+	pos := 50
+	timesAtZero := 0
+
+	scanner := bufio.NewScanner(inputf)
+	for scanner.Scan() {
+		line := scanner.Text()
+		turn, err := parseTurn(line)
+		if err != nil {
+			log.Fatalf("failed to parse turn: %v", err)
+		}
+
+		pos = turn.apply(pos)
+
+		if pos == 0 {
+			timesAtZero++
+		}
+	}
+
+	if err := scanner.Err(); err != nil {
+		log.Fatalf("scanner error: %v", err)
+	}
+
+	fmt.Println(timesAtZero)
+}
+
+type turn struct {
+	dir   direction
+	count int
+}
+
+func (t turn) apply(pos int) int {
+	switch t.dir {
+	case left:
+		pos -= t.count
+	case right:
+		pos += t.count
+	}
+
+	return ((pos % 100) + 100) % 100
+}
+
+func parseTurn(line string) (turn, error) {
+	if len(line) < 2 {
+		return turn{}, fmt.Errorf("line too short: %q", line)
+	}
+
+	dir, err := parseDir(line[:1])
+	if err != nil {
+		return turn{}, err
+	}
+
+	countStr := line[1:]
+	count, err := strconv.Atoi(countStr)
+	if err != nil {
+		return turn{}, fmt.Errorf("failed to parse %s as an int: %w", countStr, err)
+	}
+
+	return turn{dir: dir, count: count}, nil
+}
+
+type direction int
+
+const (
+	left direction = iota + 1
+	right
+)
+
+func parseDir(s string) (direction, error) {
+	switch s {
+	case "L":
+		return left, nil
+	case "R":
+		return right, nil
+	default:
+		return 0, fmt.Errorf("invalid direction: %s", s)
+	}
+}