void extraLongFactorials(int n) {

    vector <int> a;
    a.push_back(1);
    int c(0);
    int d(0);
    for(int i(2);n>=i;++i){
        int m = a.size();
        for(int j(0);j<m;j++){
            int k = a[j]*i + c*d;
            a[j] = k%10;
            c=0;
            if(k>=10){
                if(j+1==m){
                a.push_back(k/10);
                } else {
                c=1;
                d=k/10;
                }
            }
        }
        while(a[a.size()-1]>10){
            int r = a[a.size()-1];
            a[a.size()-1] = r%10;
            a.push_back(r/10);
        }
    }
    for(int i(a.size()-1); i>=0;--i ){
    cout << a[i];
}
}