以下はCircomの簡単な回路で、1つの入力xを受け取り、2 * xを出力する：
```
template TwoTimesInput(x) => result;
    const two = 2;
    result <= two * x;
endtemplate
```
Here is a simple circuit in Circom that takes one input x and outputs 2 * x:
template TwoTimesInput(x) => result;
    const two = 2;
    result <= two * x;
endtemplate