Problems
School concert
School concert
At the school concert $a$ students sang, $b$ students danced, and $c$ students sang and danced. How many participants were there in total?
\InputFile
Three positive integers $a, b$ and $c~(a, b, c \le 10^{18})$.
\OutputFile
Print the number of participants at the school concert.
Input example #1
13 9 5
Output example #1
17