diff --git a/03/index.ts b/03/index.ts
new file mode 100644
index 0000000..f7d7048
--- /dev/null
+++ b/03/index.ts
@@ -0,0 +1,128 @@
+import fs from "node:fs";
+
+const data = fs.readFileSync("./inputs/input", "utf8");
+
+console.log(
+  "part one:",
+  data
+    .split("\n")
+    .slice(0, -1) // remove empty trailing newline
+    .reduce((total, line) => {
+      let state = {
+        char: "",
+        multiplicand: "",
+        multiplier: "",
+      };
+      for (let index = 0; index < line.length; index++) {
+        switch (true) {
+          case "0123456789".includes(line[index]) && state.char === "(":
+            state.multiplicand += line[index];
+            break;
+          case "0123456789".includes(line[index]) && state.char === ",":
+            state.multiplier += line[index];
+            break;
+          case state.char === "(" &&
+            line[index] === "," &&
+            state.multiplicand !== "":
+            state.char = line[index];
+            break;
+          case line[index] === ")" &&
+            state.char === "," &&
+            state.multiplier !== "":
+            total +=
+              parseInt(state.multiplicand, 10) * parseInt(state.multiplier, 10);
+            state = { char: "", multiplicand: "", multiplier: "" };
+            break;
+          case line[index] === "m" && state.char === "":
+          case line[index] === "u" && state.char === "m":
+          case line[index] === "l" && state.char === "u":
+          case line[index] === "(" && state.char === "l":
+            state.char = line[index];
+            break;
+          default:
+            state = { char: "", multiplicand: "", multiplier: "" };
+            break;
+        }
+      }
+      return total;
+    }, 0)
+);
+
+console.log(
+  "part two:",
+  data
+    .split("\n")
+    .slice(0, -1) // remove empty trailing newline
+    .reduce(
+      (total, line) => {
+        let state = {
+          char: "",
+          multiplicand: "",
+          multiplier: "",
+          on: total.on,
+        };
+        for (let index = 0; index < line.length; index++) {
+          switch (true) {
+            case "0123456789".includes(line[index]) && state.char === "mul(":
+              state.multiplicand += line[index];
+              break;
+            case "0123456789".includes(line[index]) && state.char === ",":
+              state.multiplier += line[index];
+              break;
+            case state.char === "mul(" &&
+              line[index] === "," &&
+              state.multiplicand !== "":
+              state.char = line[index];
+              break;
+            case line[index] === ")" &&
+              state.char === "," &&
+              state.multiplier !== "":
+              if (state.on) {
+                total = {
+                  ...total,
+                  sum: (total.sum +=
+                    parseInt(state.multiplicand, 10) *
+                    parseInt(state.multiplier, 10)),
+                };
+              }
+              state = {
+                ...state,
+                char: "",
+                multiplicand: "",
+                multiplier: "",
+              };
+              break;
+            case line[index] === ")" && state.char === "don't(":
+              state = { char: "", multiplicand: "", multiplier: "", on: false };
+              break;
+            case line[index] === ")" && state.char === "do(":
+              state = { char: "", multiplicand: "", multiplier: "", on: true };
+              break;
+            case line[index] === "m" && state.char === "":
+            case line[index] === "u" && state.char === "m":
+            case line[index] === "l" && state.char === "mu":
+            case line[index] === "(" && state.char === "mul":
+            case line[index] === "d" && state.char === "":
+            case line[index] === "o" && state.char === "d":
+            case line[index] === "n" && state.char === "do":
+            case line[index] === "(" && state.char === "do":
+            case line[index] === "'" && state.char === "don":
+            case line[index] === "t" && state.char === "don'":
+            case line[index] === "(" && state.char === "don't":
+              state.char += line[index];
+              break;
+            default:
+              state = {
+                ...state,
+                char: "",
+                multiplicand: "",
+                multiplier: "",
+              };
+              break;
+          }
+        }
+        return { ...total, on: state.on };
+      },
+      { sum: 0, on: true }
+    ).sum
+);
diff --git a/index.tmpl.ts b/index.tmpl.ts
new file mode 100644
index 0000000..2a5b8f1
--- /dev/null
+++ b/index.tmpl.ts
@@ -0,0 +1,13 @@
+import fs from "node:fs";
+
+const data = fs.readFileSync("./inputs/input", "utf8");
+
+console.log(
+  "part one:",
+  data.split("\n").slice(0, -1) // remove empty trailing newline
+);
+
+console.log(
+  "part two:",
+  data.split("\n").slice(0, -1) // remove empty trailing newline
+);
diff --git a/today.sh b/today.sh
index 79b8522..94ffe3d 100755
--- a/today.sh
+++ b/today.sh
@@ -15,4 +15,7 @@ if [ ! -f "${padded}/inputs/input" ]; then
         -A "https://git.yetaga.in/alazyreader/AdventOfCode${__year}/" \
         -H "Cookie: session=`cat .cookie`" https://adventofcode.com/${__year}/day/${__day##0}/input > "${padded}/inputs/input"
 fi
+if [ ! -f "${padded}/index.ts" ]; then
+    cp index.tmpl.ts ${padded}/index.ts
+fi
 open "https://adventofcode.com/${__year}/day/${__day##0}"