KöMaL 2015 C1311

Each of the numbers $\frac{1}{3}$; 0,375; 1; 1,4; $\sqrt{2}$; $\frac{13}{8}$; 2; $\frac{13}{5}$; $\frac{8}{3}$; 3; 4; $\sqrt{18}$; $\sqrt{32}$ is given either a plus sign or a minus sign, and then the sum is calculated. In how many different ways may we choose the signs to get $1$ as a sum?