Fill in each square on the left with a digit (0 to 9), and fill in each circle with any one of the 4 arithmetic operations \( (+, -, \times, \div ) \).

We can get many numbers like:

\[ \begin{array} { c c c c c }

3 & - & 2 & = & 1 \\
1 & \times & 2 & = & 2 \\

2 & + & 1 & = & 3 \\
1 & + & 3 & = & 4 \\

& & \vdots & & \\
\end{array} \]

What is the smallest positive integer that we cannot achieve?

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