题解 | #汽水瓶#

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()){
        let empties = parseInt(line)
        if (empties === 0) {
            break;
        }

        const count = (empties - (empties % 2)) / 2;
        console.log(count);
    }
}()