Elisp, 12 10 bytes

(%(read)2)

(read) evaluates to the input, and the (% ...) expression is then evaluated. Outputs 1 for odd, 0 for even.

Test cases:

(Input):(Output)
1:1
2:0
16384:0
99999999:1

Edit: Saves 2 bytes thanks to @Dylan, for asking if it was possible to leave out the spaces in a Elisp expression. Turns out the answer is yes!

Elisp, 12 10 bytes

(%(read)2)

(read) evaluates to the input, and the (% ...) expression is then evaluated. Outputs 1 for odd, 0 for even.

Test cases:

(Input):(Output)
1:1
2:0
16384:0
99999999:1

Edit: Saves 2 bytes thanks to @Dylan, for asking if it was possible to leave out the spaces in a Elisp expression. Turns out the answer is yes!

Elisp, 12 bytes

(% (read) 2)

(read) evaluates to the input, and the (% ...) expression is then evaluated. Outputs 1 for odd, 0 for even.

Test cases:

(Input):(Output)
1:1
2:0
16384:0
99999999:1

Elisp, 12 10 bytes

(%(read)2)

(read) evaluates to the input, and the (% ...) expression is then evaluated. Outputs 1 for odd, 0 for even.

Test cases:

(Input):(Output)
1:1
2:0
16384:0
99999999:1

Edit: Saves 2 bytes thanks to @Dylan, for asking if it was possible to leave out the spaces in a Elisp expression. Turns out the answer is yes!