Pareto MLE

Suppose that $X_1 \mid \theta,\dots, X_n \mid \theta \sim \text{Pareto}(\theta)$ IID, which means they have PDF $f(x \mid \theta) = \frac{\theta}{x^{\theta + 1}}I_{(1,\infty)}(x)$. If it exists, find the MLE of $\theta$ with the data $\{2,5,3,4\}$ to the nearest hundredth. If it doesn't exist, report $-1$.