diff --git a/src/2015/4/1/index.ts b/src/2015/4/1/index.ts
new file mode 100644
index 0000000..b4fc72b
--- /dev/null
+++ b/src/2015/4/1/index.ts
@@ -0,0 +1,13 @@
+export default async function runner(inputPath: string){
+  const input = (await Bun.file(inputPath).text()).trimEnd();
+  
+  let i = 1;
+  while (true){
+    const hash = Bun.MD5.hash(`${input}${i}`, "hex")
+    if(hash.startsWith("00000")) {
+      console.log(i);
+      return;
+    }
+    i++;
+  }
+}
diff --git a/src/2015/4/2/index.ts b/src/2015/4/2/index.ts
new file mode 100644
index 0000000..d85b1af
--- /dev/null
+++ b/src/2015/4/2/index.ts
@@ -0,0 +1,13 @@
+export default async function runner(inputPath: string){
+  const input = (await Bun.file(inputPath).text()).trimEnd();
+  
+  let i = 1;
+  while (true){
+    const hash = Bun.MD5.hash(`${input}${i}`, "hex")
+    if(hash.startsWith("000000")) {
+      console.log(i);
+      return;
+    }
+    i++;
+  }
+}