Let $a,$ $b,$ $c,$ $d$ be positive real numbers.  Find the minimum value of
\[(a + b + c + d) \left( \frac{1}{a} + \frac{1}{b} + \frac{1}{c} + \frac{1}{d} \right).\]
By AM-GM,
\[a + b + c + d \ge 4 \sqrt[4]{abcd},\]and
\[\frac{1}{a} + \frac{1}{b} + \frac{1}{c} + \frac{1}{d} \ge 4 \sqrt[4]{\frac{1}{abcd}},\]so
\[(a + b + c + d) \left( \frac{1}{a} + \frac{1}{b} + \frac{1}{c} + \frac{1}{d} \right) \ge 4 \sqrt[4]{abcd} \cdot 4 \sqrt[4]{\frac{1}{abcd}} = 16.\]Equality occurs when $a = b = c = d,$ so the minimum value is $\boxed{16}.$