Change a value from 0->1 or 1->0 with only mathematic operations

I have a variable on javascrit, initialized at 0. What I'd like to do is this :

• if the value is 0, change it to 1;
• if the value is 1, change it to 0;

and I'll avoid conditional statement (like if/else) to check what the value is.

I think I just do it with some matematic operation; I thought to a NOT operation, but I don't know how to do that operation without

x = 1-x;