Normal MLE III

Suppose that $X_1 \mid \theta, \dots, X_n \mid \theta \sim N(\mu,\sigma^2)$ IID, where $\theta = (\mu,\sigma)$ is unknown. Find the MLE of $\theta, \hat{\theta}_{MLE} = (\hat{\mu}_{MLE}, \hat{\sigma}_{MLE})$ with the data $\{1,-2,4,-1\}$ and report $\hat{\mu}_{MLE}\hat{\sigma}_{MLE}$ to the nearest thousandth. If it doesn't exist, report $-1$.