#include <iostream>
#include <fstream>
using namespace std;

int main()
{
    ifstream in("adunare.in");
    ofstream out("adunare.out");
    int a,b;
    cin>>a>>b;
    a=a+b;
    if(a&1) cout<<a;
    else out<<"I don;t care.";

    return 0;
}