How to merge Two manifest file in Unity3D 2017

Question

I have two manifest files in my Unity

One is for Google Play Game Services

<?xml version="1.0" encoding="utf-8"?>
<!-- This file was automatically generated by the Google Play Games plugin for Unity
     Do not edit. -->
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.google.example.games.mainlibproj"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk android:minSdkVersion="8" android:targetSdkVersion="16" />


    <application>



        <!-- The space in these forces it to be interpreted as a string vs. int -->
        <meta-data android:name="com.google.android.gms.games.APP_ID"
            android:value="\ 466669193109" />

        <!-- Keep track of which plugin is being used -->
        <meta-data android:name="com.google.android.gms.games.unityVersion"
            android:value="\ 0.9.50" />

        <activity android:name="com.google.games.bridge.NativeBridgeActivity"
            android:theme="@android:style/Theme.Translucent.NoTitleBar.Fullscreen" />
    </application>
</manifest> 

And

One if for Google Mobile Ads

<?xml version="1.0" encoding="utf-8"?>
<!--
This Google Mobile Ads plugin library manifest will get merged with your
application's manifest, adding the necessary activity and permissions
required for displaying ads.
-->
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.google.unity.ads"
    android:versionName="1.0"
    android:versionCode="1">
  <uses-sdk android:minSdkVersion="14"
      android:targetSdkVersion="19" />
  <application>
  </application>
</manifest>

When I try to build my android application

I get this error

I tried to solve it by Deleting the Google Mobile Ads Manifest

but then it says missing the manifest

I tried to merged them also but again failed

I am really stuck