Which padding value is set to 0 around the paragraph?

<html>
<head><style>p{background-color: lightBLUE;padding: 0PX 20PX 20px 20px; border: solid 2px gray;width: 100px;height: 100px;}
</style>
</head>
<body>
    <p>Perfectly balanced, as all things should be.</p>
</body>
</html>]]>
The first valueThe third valueThe second and fourth valuesThe second padding

The first value.