gistfile1.xml

    <plurals name="x_guests">
        <item quantity="one">@string/x_guests_one</item>
        <item quantity="few">@string/x_guests_few</item>
        <item quantity="many">@string/x_guests_many</item>
        <item quantity="other">@string/x_guests_other</item>
    </plurals>

    <string name="x_guests_few">%1$d guests</string>
    <string name="x_guests_many">%1$d guests</string>
    <string name="x_guests_one">%1$d guest</string>
    <string name="x_guests_other">%1$d guests</string>