SOURCE

function hasTwoBorder(array) {
  return array.filter(function(item) {
    return item > 0;
  }).length > 1;
}

function zeroAndNegativeNumber(array) {
  var startIndex;
  var endIndex;
  var sum = 0;
  for (var i = 0; i < array.length; i++) {
    if (array[i] > 0) {
      startIndex = i;
      break;
    }
  }
  for (var i = array.length - 1; i >= 0; i--) {
    if (array[i] > 0) {
      endIndex = i;
      break;
    }
  }
  for (var i = startIndex; i < endIndex; i++) {
    if (array[i] <= 0) {
      sum++;
    }
  }
  return sum;
}

function reduceOne(array) {
  return array.map(function(item) {
    return item - 1;
  });
}


function getAccount(array) {
  var sum;
  if (!hasTwoBorder(array)) {
    return 0;
  }
  sum = zeroAndNegativeNumber(array) + getAccount(reduceOne(array));
  return sum;
}

console.log(getAccount([2, 0,1,2]))