Let \( y(x) = (1 + x)(1 + x^2)(1 + x^4)(1 + x^8)(1 + x^{16}) \). Then \( y' - y'' \) at \( x = -1 \) is equal to:
\( 944 \)
\( 464 \)
\( 496 \)
\( 976 \)