喝酒，酒瓶瓶盖换酒js解决

function computeWine(num) {
var pingzi = num, gaizi = num;
var total = num;
recurrence();
function recurrence() {
if (pingzi < 3 && gaizi < 4) {
return;
}
if (pingzi >= 3) {
var beishu = Math.floor(pingzi / 3);
pingzi = pingzi - beishu * 3 + Math.floor(pingzi / 3);
gaizi = gaizi + beishu;
total = total + beishu;
} else {
var beishu1 = Math.floor(gaizi / 4);
gaizi = gaizi - beishu1 * 4 + Math.floor(gaizi / 4);
pingzi = pingzi + beishu1;
total = total + beishu1;
}

recurrence();
}

return total;
}

console.log(computeWine(10));