# Calculate the security of a cascade cipher

I’m reading “The Security of Multiple Encryption in the Ideal Cipher Model” and I’m having a hard time understanding something. How do I calculate the bounds of cascade cipher from the following formula (where $k$ determines keysize and $n$ is the blocksize)?

$\exp\left(k+\min\left\{\frac{k(ℓ′−2)}{2}, \frac{n(ℓ′−2)}{ℓ′}\right\}\right)$   where $ℓ$ is the cascade length and $ℓ > 1$

If there is a cascade of AES, Blowfish and DES then what will be the value of $k$? and what will be the value of $n$? is this just addition of the key size used by these block ciphers for determining the value $k$ and addition of the blocksizes for determining the value of $n$?

If the case is AES $\to$ DES $\to$ AES $\to$ DES $\to$ Blowfish, then is this just five times addition to determine $k$ and $n$?