$ E(2) = 8a + 4b + 2c + d = 58 $
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- $$ 6(15) + b = 120 \Rightarrow 90 + b = 120 \Rightarrow b = 30 $$
- $$ 4(15) + 2(30) + c = 120 \Rightarrow 60 + 60 + c = 120 \Rightarrow c = 0 $$
- $ E(1) = a + b + c + d = 20 $
- $ E(3) = 27a + 9b + 3c + d = 132 $
- $ E(4) = 64a + 16b + 4c + d = 26^3 = 17576 $
- - 17316 + 31725 + d = 20 \Rightarrow (2889 - 17316) = -14427, \quad -14427 + 31725 = 17298
