Let $a,$ $b,$ $c,$ $d$ be the roots of
\[2x^4 - 8x^3 + 7 = 0.\]Find $a + b + c + d.$
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Let $a,$ $b,$ $c,$ $d$ be the roots of
\[2x^4 - 8x^3 + 7 = 0.\]Find $a + b + c + d.$
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
4
Let $a,$ $b,$ $c,$ $d$ be the roots of
\[2x^4 - 8x^3 + 7 = 0.\]Find $a + b + c + d.$
train