Given that three different prime numbers a, B and C satisfy ABC + a = 2000, then a + B + C=______ .

Given that three different prime numbers a, B and C satisfy ABC + a = 2000, then a + B + C=______ .

∵ ABC + a = 2000, ∵ a (BBC + 1) = 2000. ∵ 8 | 2000, ∵ a, (BBC + 1) are even numbers. Also ∵ a, B, C are different prime numbers, and 2 is the only even number in prime numbers, ∵ a = 2. ∵ BBC + 1 = 20002 = 1000, ∵ BBC = 999. And ∵ 999 = 33 × 37, and (3,37) = 1, ∵ B = 3, C = 37, ∵