local mfl, mce = math.floor, math.ceil
local n = io.read("*n")
local a = {}
for i = 1, n do
  a[i] = io.read("*n")
end
local sum = 0
for i = n, 1, -1 do
  if i < a[i] then print("No") os.exit() end
  if (a[i] + sum) % i ~= 0 then
    print("No") os.exit()
  end
  sum = sum + mfl((a[i] + sum) / i)
end
print("Yes")