struct BigInt{
    vector<unsigned char> d;

    inline const unsigned char D(int ind){
        return ind>=d.size()?0:d[ind];
    }

    const BigInt operator+ (const BigInt &other){
        BigInt ans;
        int stop=max(other.d.size(), d.size())+1;
        unsigned char carry=0;
        for(int i=0; i < stop; ++i){
            if(D(i) > 255-carry || 255-carry-D(i) < other.D(i))
        }
    }
}