function sampleCalc() {
    var sample = 5.2+90*Math.sin(1)/3;
}

function bench(n) {
    var startTime = new Date();
    for (var i=0; i<n; i++) {
        sampleCalc();
    }
    var endTime = new Date();
    d = endTime.getTime() - startTime.getTime();
    if (d < 200) 
        return bench(n * 5);
    else 
        return Math.round(n * 1000 / d);
}