var brute = function(x) {
var code = ('000'+x).slice(-3);
document.getElementsByName('code')[0].value = code;
document.getElementsByTagName('button')[0].click();
if (!document.getElementsByClassName('message')[0].innerHTML.includes('Kod nie działa.')) console.log('code: ', code)
if (x < 1000) setTimeout(() => brute(x+1), (Math.random()*200)+100);
}