Mr. Renaud has 2019 earned income for RRSP purposes of $35000. His employer reports a 2019 pension adjustment of $4500. His unused RRSP deduction room carried forward from 2019 was $27000. During 2020, he contributes $5100 to his RRSP and chooses to deduct the full amount contributed. If Mr. Renaud wanted to deduct his maximum RRSP deduction, how much more would he have to contribute to do so?