The evaluation metric for this competition is NDCG (Normalized discounted cumulative gain) @ k where k=3.

#Submission File
For each new user, you are to make a maximum of 3 predictions on the country of the first booking. The file should contain a header and have the following format:

    id,country_destination
    f3g7ae12j0,NDF
    ks0uq0sd8x,NDF
    8w236a1unv,NDF
    vd221xgcu6,NDF
    etc.

Each prediction should be in a new row. However, all the predictions for a user must be made one after the other and ordered such that the most probable destination country goes first.