Values of the sample total at which the UMP test rejects

Let $X_1,X_2,X_3,X_4$ be a random sample from an $N(\theta,1)$ distribution, where $\theta\in(-\infty,\infty)$. Suppose the null hypothesis $H_0:\theta=1$ is to be tested against the hypothesis $H_1:\theta<1$ at $\alpha=0.05$ level of significance. For what observed values of $\sum_{i=1}^4X_i$, the uniformly most powerful test would reject $H_0$?