java.lang.Long cannot be cast to java.lang.Integer

I want to read a map map from the Database (Firebase),and i compare it to another map motcle, if i find a duplicate key i increment the value of the key in map,I am having a ClassCastException. the code:

public void addMotcle(final Map motcle, String Userid)
{
    mDatabase = FirebaseDatabase.getInstance().getReference("User");
    DatabaseReference user = mDatabase.child(Userid);
    final DatabaseReference keylist = user.child("motcle");
    keylist.addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            if(dataSnapshot.exists())
            {   
                //I tried to put the map in another map and change it but 
                //It is still the same error
                Map<String,Integer> map = (Map) dataSnapshot.getValue();
                Map<String,Integer>Hmap= new HashMap<>();
                Hmap.putAll(map);
                //if there is duplicate we incremente les mots clé
                for (Object key : motcle.keySet()) {
                    if (Hmap.containsKey(key)) {
                        Hmap.put((String)key,((Integer) Hmap.get(key))+1);
                    }
                    else
                    {
                        Hmap.put((String) key,1);
                    }
                }
               keylist.setValue(Hmap);

            }
            else
            {
             keylist.setValue(motcle);

            }
        }

        @Override
        public void onCancelled(DatabaseError databaseError) {

        }
    });



}

Here is the Value that i want to write on in Firebase

the error is in the line map.put((String)key,map.get(key)+1);

why can't i write an Integer in the value if i declared map as Map<String,Integer> ?