# What Integers Were Used?

Logic Level 1

$\begin{array} { l l l l l l } & & & & & & \square \\ & & & & & \square & 6 \\ + & & & & \square & 5 & 4 \\ \hline & & & & 3 & 2 & 1\\ \end{array}$

Find the sum of all the missing digits in the addition above.

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