$(document).ready(function() {
        var biggest = 0;
        var bigIndex = 0;
        $("#list li").each(function(i,el){
            var val = parseInt($(el).text());
            if(val > biggest) {
                biggest = val;
                bigIndex = i
            }
        });
        alert("postion "+ (bigIndex + 1) + " is the biggest");
        $("#list li").eq(bigIndex).addClass('bigger');
    });