Math help?

Question

What is the math steps required to solve this problem?
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"Volunteers have been divided into 5 groups with equal number of members. If any group has fewer than 5 people, more volunteers must be recruited to fill the empty spots.
Write a program that takes the number of volunteers and outputs to the console how many volunteers need to be hired to have 5 equal groups.
Sample Input
24
Sample Output
1
Explanation
The nearest number to 24 that is multiple of 5 is 25, so we need 1 more volunteer (24+1=25) to get 5 equal groups."

Answer 1

hired = 5 - ( volunteers % 5 )