#include <iostream>
#include <fstream>

using namespace std;

int main()
{

	ifstream in("adunare.in", ios::in);
	ofstream out("adunare.out", ios::out);

    int a;
    in >> a;
    int b;
    in >> b;

    int max_result = 2000000000;
    int long long c = a + b;
    if(c > max_result)
        out << "oferflow";
    else
        out << c;

    return 0;
}