Select four numbers from the five numbers 1, 2, 3, 4, and 5 to form a number that is both a multiple of 3 and a multiple of 5. How many numbers should be removed?
从1，2，3，4，5这五个数字中选出四个数字组成一个既是3的倍数，又是5的倍数的数，应该去掉数字多少
<result>3</result>