백준 2455 Java 자바

 

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.StringTokenizer;
 
public class Q2455 {
 
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int people = 0;
        int max = 0;
        for(int i = 0; i < 4; i++) {
            StringTokenizer st = new StringTokenizer(br.readLine());
            int out = Integer.parseInt(st.nextToken());
            int in = Integer.parseInt(st.nextToken());
            people -= out;
            people += in;
            if(people > max) {
                max = people;
            }
        }
        System.out.println(max);
 
    }
 
}