import Control.Applicative
import Control.Monad
import Control.Monad.ST
import Data.Array.ST
import Data.STRef

primes :: Int -> [Int]
primes n = runST $ do
    a <- newArray (0, n) True :: ST s (STUArray s Int Bool)
    forM_ (takeWhile (\i -> i * i <= n) [3, 5..]) $ \i -> do
        v <- readArray a i
        when v $ forM_ [i * i, i * i + i .. n] $ \j -> writeArray a j False
    ps <- newSTRef [] :: ST s (STRef s [Int])
    modifySTRef ps (2:)
    forM_ [3, 5..n] $ \i -> do
        v <- readArray a i
        when v $ modifySTRef ps (i:)
    readSTRef ps

solve n l = sum . map f $ primes ((l + 1) `div` (n - 1))
    where
        f p = max 0 (l - p * (n - 1) + 1)
    
main = do
    [n, l] <- map read . words <$> getLine :: IO [Int]
    print $ solve n l