Basics: How accurate is the prime number theorem for "small" values?

The prime number theorem states that: $\text{The }n\text{-th prime}\approx n\ln n$ and this approximation gets better and better as $n\rightarrow\infty$ .

But how accurate is the prime number theorem for small values? Your mission is to find the difference between the exact value of the 3435-th prime and the value obtained using the prime number theorem. (it must be positive)