def migratoryBirds(arr):
    # Write your code here
    sights = {1:0,2:0,3:0,4:0,5:0}
    for bird_type in arr:
        sights[bird_type] += 1
    sorted_by_sights = sorted(sights.items(), key=lambda item: item[1], reverse=True)
    return sorted_by_sights[0][0]