diff --git a/Problem1.java b/Problem1.java
index 8b137891..b8bd67a8 100644
--- a/Problem1.java
+++ b/Problem1.java
@@ -1 +1,25 @@
+import java.io.*;
+class solution {
 
+    static int searrch(int[] arr, int size) {
+        int L = 0, R = size - 1;
+        int mid;
+
+        while ((R - L) > 1) {
+            mid = (L + R) / 2;
+            if ((arr[L] - L) != (arr[mid] - mid)) {
+                R = mid;
+            } else if ((arr[R] - R) != (arr[mid] - mid)) {
+                L = mid;
+            }
+        }
+
+        return arr[L] + 1;
+    }
+    public static void main(String[] args) {
+        int[] arr = { 1, 2, 3, 4, 5, 6, 8 };
+        int size = arr.length;
+
+        System.out.println("Missing number: " + search(arr, size));
+    }
+}