Alice and Mike file a joint return for 2023 on April 18, 2024. Alice, who is a nonworking spouse, is 49. Both Alice and Mike contributed $2,000 each to a traditional IRA, although they qualified to contribute the maximum amount. They filed their return timely. On June 1, 2024, Mike's mother gave each of them $1,000. What additional amount of the gift may Alice and Mike contribute to each of their IRAs for the year 2023