National insurance code in the United Kingdom, every resident is issued a national insurance "number" for the national health system and social security. The format of the "number" is two letters, followed by six digits, and then a third letter. The first two letters cannot be D,F,I,Q,U, or V, and the second letter also cannot be O. The last letter is either A,B,C, or D. All six digits can be 0 through 9, with no restrictions. How many national insurance numbers can be issued with these restrictions?