import qualified Data.ByteString.Char8 as C
import Data.Char
import Data.Array.IO

main :: IO ()
main = do
  s1 <- C.getLine
  let (l, r1) = nextInt s1
  s2 <- C.getLine
  let (n, r2) = nextInt s2
  xs <- newArray (0, 10100) 0 :: IO(IOUArray Int Int)
  s3 <- C.getLine
  set n s3 xs
  writeArray xs 10010 1000000
  ans <- solve 0 l xs
  print ans

set :: Int -> C.ByteString-> IOUArray Int Int -> IO ()
set n ss xs
  | n == 0    = return ()
  | otherwise = set2 n ss xs

set2 :: Int ->  C.ByteString -> IOUArray Int Int -> IO ()
set2 n ss xs = do
  let (w,rs) = nextInt ss
  y <- readArray xs w
  writeArray xs w (y + 1)
  set (n - 1) rs xs
  
solve :: Int -> Int -> IOUArray Int Int -> IO Int
solve n l xs = do
  y <- readArray xs n
  if l >= y * n then do {
    t <- solve (n + 1) (l - y * n) xs;
    return $ t + y;
    }
    else return $ div l n
  
nextInt :: C.ByteString -> (Int, C.ByteString)
nextInt ss
  | isDigit x = nextInt2 0 ss
  | otherwise = nextInt $ C.tail ss
  where x = C.head ss

nextInt2 :: Int -> C.ByteString -> (Int, C.ByteString)
nextInt2 n ss
  | C.null ss = (n, ss)
  | isDigit y = nextInt2 (n * 10 + (digitToInt y)) ys
  | otherwise = (n, ys)
  where y  = C.head ss
        ys = C.tail ss