Let $ x$ be a real number such that the five numbers $ \cos(2 \pi x)$, $ \cos(4 \pi x)$, $ \cos(8 \pi x)$, $ \cos(16 \pi x)$, and $ \cos(32 \pi x)$ are all nonpositive.  What is the smallest possible positive value of $ x$?
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Let $ x$ be a real number such that the five numbers $ \cos(2 \pi x)$, $ \cos(4 \pi x)$, $ \cos(8 \pi x)$, $ \cos(16 \pi x)$, and $ \cos(32 \pi x)$ are all nonpositive.  What is the smallest possible positive value of $ x$?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
\frac{21}{64}
Let $ x$ be a real number such that the five numbers $ \cos(2 \pi x)$, $ \cos(4 \pi x)$, $ \cos(8 \pi x)$, $ \cos(16 \pi x)$, and $ \cos(32 \pi x)$ are all nonpositive.  What is the smallest possible positive value of $ x$?
train