# School concert

Execution time limit is 1 second

Runtime memory usage limit is 128 megabytes

At the school concert $a$ students sang, $b$ students danced, and $c$ students sang and danced. How many participants were there in total?

## Input

Three positive integers $a,b$ and $c(a,b,c≤10_{18})$.

## Output

Print the number of participants at the school concert.

## Examples

Input #1

Answer #1

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