题解 | #跳台阶扩展问题#

const rl = require("readline").createInterface({ input: process.stdin });
var iter = rl[Symbol.asyncIterator]();
const readline = async () => (await iter.next()).value;



void async function () {
    // Write your code here
    while(line = await readline()){
        const n = parseInt(line);
        if (n < 2) {
            console.log(1);
        } else {
            console.log(2**(n-1))
        }
    }
}()