struct BigInterger {

    static const int BASE = 1e8;

    static const int WIDTH = ;

    vector<int> s;

    BigInterger(long long num = ) { *this = num; }

    BigInterger operator =(long long num) {

        s.clear();

        do {

            s.push_back(num%BASE);

            num /= BASE;

        } while (num > );//num==0

        return *this;

    }

    BigInterger operator =(const string& str) {

        s.clear();

        int x, len = (str.length() - ) / WIDTH + ;//len==width

        for (int i = ; i < len; i++) {

            int end = str.length() - i*WIDTH;

            int start = max(, end - WIDTH);

            sscanf(str.substr(start, end - start).c_str(), "%d", &x);

            s.push_back(x);

        }

        return *this;

    }

    BigInterger operator +(const BigInterger& b)const {

        BigInterger c;

        c.s.clear();

        for (int i = , g = ;; i++) {

            if (g ==  && i >= max(s.size(), b.s.size()))break;//此处bug

            int x = g;

            if (i < s.size())x += s[i];

            if (i < b.s.size()) x += b.s[i];

            c.s.push_back(x%BASE);

            g = x / BASE;

        }

        return c;

    }

    BigInterger operator +=(const BigInterger& b) {

        *this = *this + b; return *this;

    }

    bool operator<(const BigInterger& b)const {

        if (s.size() != b.s.size()) return s.size() < b.s.size();

        for (int i = s.size() - ; i >= ; i--) {

            if (s[i] != b.s[i]) return s[i] < b.s[i];//Width 个数字一起比

        }

        return false;//==

    }

    bool operator>(const BigInterger &b)const { return b < *this; }

    bool operator<=(const BigInterger &b)const { return !(b < *this); }

    bool operator>=(const BigInterger &b)const { return !(*this < b); }

    bool operator!=(const BigInterger &b)const { return b < *this || *this<b; }

    bool operator==(const BigInterger &b)const { return!(b < *this) && !(*this<b); }

};

ostream& operator <<(ostream &out, const BigInterger& x) {

    out << x.s.back();

    for (int i = x.s.size() - ; i >= ; i--) {

        char buf[];

        sprintf(buf, "%08d", x.s[i]);

        for (int j = ; j < strlen(buf); j++)cout << buf[j];

    }

    return out;

}

istream&operator>>(istream &in, BigInterger&x) {

    string s;

    if (!(in >> s))return in;

    x = s;

    return in;

}