local mmi, mma = math.min, math.max
local h, a, d = io.read("*n", "*n", "*n")
local dp = {}
for i = 1, h do
  dp[i] = 1000000007
end
dp[h] = 0
local ret = 1000000007
for i = h, 1, -1 do
  if a < i then
    dp[i - a] = mmi(dp[i - a], dp[i] + 1)
  else
    ret = mmi(ret, dp[i] + 1)
  end
  if d < i then
    dp[i - d] = mmi(dp[i - d], dp[i] + 1.5)
  else
    ret = mmi(ret, dp[i] + 1.5)
  end
end
print(ret)