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It all comes down to a quadratic equation: 2 0 1 8 a + 5 6 + a 2 + 2 0 1 8 5 6 + a + 5 6 2 = 2 0 1 8 4 4 0 5 1 Multiply both sides by 2 0 1 8 : a 2 + 2 a + 3 2 4 8 = 4 4 0 5 1 Subtracting 4 4 0 5 1 from both sides: a 2 + 2 a − 4 0 8 0 3 = 0 The coefficients are as follows: x = 1 , y = 2 , z = − 4 0 8 0 3 . Now writing the quadratic equation: a 1 2 = 2 x − y ± Δ Whereas Δ is the discriminant, Δ = y 2 − 4 x z . Δ = 2 2 + 4 ⋅ 4 0 8 0 3 = 4 ⋅ 4 0 8 0 4 Now, substituting with the numerical values: a 1 2 = 2 − 2 ± 4 ⋅ 4 0 8 0 4 A nice observation to make our life easier: 4 0 8 0 4 = 2 0 2 2 : a 1 2 = 2 − 2 ± 2 ⋅ 2 0 2 = − 1 ± 2 0 2 So a is either 2 0 1 or − 2 0 3 , and therefore 2 0 1 8 + a is either 2 2 1 9 or 1 8 1 5 . Since we are looking for the minimal value, the correct answer is 1815 .