import java.util.Arrays;
import java.util.Scanner;public class DemoTest4 {public static void main(String[] args) {Scanner in = new Scanner(System.in);// 注意 hasNext 和 hasNextLine 的區別while (in.hasNextLine()) { // 注意 while 處理多個 caseint[] arr = Arrays.stream(in.nextLine().split(" ")).mapToInt(Integer::parseInt).toArray();System.out.println(solve(arr));}}private static int solve(int[] arr) {int min=Integer.MAX_VALUE,res = 0;for(int k = -255;k<=255;k++){int sum =0;for(int i =0;i<arr.length;i++){int temp =arr[i]+k;if (temp>255) {temp = 255;}if(temp<0){temp = 0;}sum+=temp;}int diff = Math.abs(sum-128*arr.length);if(diff<min){min =diff;res = k;}}return res;}
}