var amount = 30;
var camels = [0,0,0,0,0,0,0,0,0,0,0,0];

while (amount > 0) {
var index = Math.floor(Math.random() * camels.length);
var previous = (camels.length + index - 1) % camels.length;
var next = (index + 1) % camels.length;

if (Math.abs(camels[index] + 1 - camels[previous]) <= 1
    && Math.abs(camels[index] + 1 - camels[next]) <= 1) {

    camels[index]++;
    amount--;
}
}