Sum of Rounded Values

Background

Dawei assigned a practice problem about integer rounding.

Problem Description

For this problem, we'll round an int value up to the next multiple of $10$ if its rightmost digit is $5$ or more, so $15$ rounds up to $20$. Alternately, round down to the previous multiple of $10$ if its rightmost digit is less than $5$, so $12$ rounds down to $10$. Given $3$ ints, $a, b, c$, return the sum of their rounded values. To avoid code repetition, write a separate helper public int round10(int num) and call it $3$ times. Write the helper entirely below and at the same indent level as roundSum().

Input Format

Input consists of three integers $a, b, c$.

a b c

Output Format

Output a single integer, the sum of the rounded values of $a, b, c$.

sum

Sample

16 17 18

60

12 13 14

30

6 4 4

10

Sample Explanation

Sample 1: $16$ rounds up to $20$, $17$ rounds up to $20$, $18$ rounds up to $20$. Total sum is $20 + 20 + 20 = 60$.

Sample 2: $12$ rounds down to $10$, $13$ rounds down to $10$, $14$ rounds down to $10$. Total sum is $10 + 10 + 10 = 30$.

Sample 3: $6$ rounds up to $10$, $4$ rounds down to $0$, $4$ rounds down to $0$. Total sum is $10 + 0 + 0 = 10$.

Constraints

Time limit for each test case is $1$ second, and memory limit is $1024$ KiB.