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### Combining multiple symmetric encryption algorithms - implications?

I was just wondering if I add more security by combining two or more symmetric encryptions on a plain text. For example: Plaintext → AES → Twofish → Serpent Of ...
I want to calculate the time complexity of two encryption and decryption algorithms. The first one (RSA-like) has the encryption $$C := M^e \bmod N$$ and decryption $$M_P := C^d \bmod N.$$ ...