diff --git a/Basic Codes/Birthday.java b/Basic Codes/Birthday.java
new file mode 100644
index 0000000..ffc11d0
--- /dev/null
+++ b/Basic Codes/Birthday.java	
@@ -0,0 +1,12 @@
+//Birthday Paradox problem
+class HBD {
+    static double find(double p) {
+        return Math.ceil(Math.sqrt(2 * 365 * Math.log(1 / (1 - p))));
+    }
+
+    //Driver
+    public static void main(String[] args){
+
+        System.out.println(find(0.70));
+    }
+}
\ No newline at end of file