https://www.acmicpc.net/problem/2753
if else 문 사용
import java.util.*;
public class Main{
public static void main(String args[]){
Scanner sc = new Scanner(System.in);
int year = sc.nextInt();
if(year%4 == 0 && year%100 != 0)
System.out.println("1");
else if(year%400 == 0)
System.out.println("1");
else
System.out.println("0");
}
}