const fs = require('fs');

function read(cb) {
    fs.readFile('./input', 'utf8', (err, data) => {
        data.split("\n").forEach((line) => {
            var currentNb = Number.parseInt(line);
            if (!isNaN(currentNb))
                return cb.onLine(currentNb);
        });
        cb.onDone();
    });
}

function Sum(nb) {
    this.number = 0;
}

Sum.prototype.onLine = function(number) {
    this.number += number;
    return true;
}

Sum.prototype.onDone = function() {
    console.log(this.number);
}

function FqFinder() {
    Sum.call(this);
    this.buffer = [0];
    this.allNumbers = [];
    this.doneReading = false;
    this.found = false;
    this.sqLen = -1;
    this.sqPos = 0;
}

FqFinder.prototype.onLine = function(number) {
    Sum.prototype.onLine.call(this, number);
    if (this.buffer.indexOf(this.number) >= 0) {
        this.found = true;
        return false;
    }
    this.buffer.push(this.number);
    if (!this.doneReading) {
        this.allNumbers.push(number);
    }
    if (this.sqLen < 0 && this.sqPos > 0 && this.sqPos %2 == 1)
        this.checkSq();
    this.sqPos++;
    if (this.sqLen > 0 && this.sqPos == this.sqLen)
        this.sqPos = 0;
    return true;
}

FqFinder.prototype.checkSq = function() {
    for (var i =0; i < this.sqPos /2; ++i) {
        if (this.allNumbers[i] != this.allNumbers[i +this.sqPos /2])
            return false;
    }
    this.sqLen = this.sqPos = this.sqPos /2;
    console.log("Found sequence ! (len=" +this.sqLen +")");
    return true;
}

FqFinder.prototype.onDone = function() {
    this.doneReading = true;
    if (!this.found) {
        if (this.sqLen == -1) {
            this.sqLen = this.sqPos;
            this.sqPos = 0;
        }
        while (this.onLine(this.allNumbers[this.sqPos]));
    }
    console.log(this.number);
}

function ex1() {
    read(new Sum());
}

function ex2() {
    read(new FqFinder());
}

ex1();
ex2();