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()){
        if(line!=0){
            let num=0;
            let a=0;
           while(parseInt(line/3)){
            num+=parseInt(line/3);
            a=line%3;
            line=parseInt(line/3);
            line = line+a;
            if(line==2){
                num+=1;
                break;}
           }
           console.log(num)
        }
    }
}()