(백준) 자바 - 3058 짝수를 찾아라
https://www.acmicpc.net/problem/3058
https://www.acmicpc.net/problem/3058
https://www.acmicpc.net/problem/2884
https://www.acmicpc.net/problem/2501
https://www.acmicpc.net/problem/2576
https://www.acmicpc.net/problem/2490