function getSum (obj) {
  let sum = 0

  for (const item of Object.values(obj)) {
    if (typeof item === 'object') {
      sum += getSum(item)
    } else {
      sum += item
    }
  }

  return sum
}

function getSum (obj) {
  let sum = 0

  for (const item of Object.values(obj)) {
    if (typeof item === 'object') {
      sum += getSum(item)
    } else {
      sum += item
    }
  }

  return sum
}

function getSum (obj) {
  let sum = 0
  let stack = [obj]

  while (stack.length) {
    const current = stack.pop()
    if (typeof current === 'object') {
      stack = stack.concat(Object.values(current))
    } else {
      sum += current
    }
  }

  return sum
}