a,b=[int(i) for i in input().split()]
c,d=[int(i) for i in input().split()]
if abs(a-c)<abs(b-d):
print(abs(a-c)+(abs(b-d)-abs(a-c)))
else:
print(abs(b-d)+(abs(a-c)-abs(b-d)))#include <bits/stdc++.h>
using namespace std;
#define Sara ios_base::sync_with_stdio(false),cin.tie(nullptr),cout.tie(nullptr);
int main()
{
long long x,y,m,r;cin>>x>>y>>m>>r;
cout<<max(abs(x-m),abs(y-r))<<endl;
}90. Subsets II | 1560A - Dislike of Threes |
36. Valid Sudoku | 557. Reverse Words in a String III |
566. Reshape the Matrix | 167. Two Sum II - Input array is sorted |
387. First Unique Character in a String | 383. Ransom Note |
242. Valid Anagram | 141. Linked List Cycle |
21. Merge Two Sorted Lists | 203. Remove Linked List Elements |
733. Flood Fill | 206. Reverse Linked List |
83. Remove Duplicates from Sorted List | 116. Populating Next Right Pointers in Each Node |
145. Binary Tree Postorder Traversal | 94. Binary Tree Inorder Traversal |
101. Symmetric Tree | 77. Combinations |
46. Permutations | 226. Invert Binary Tree |
112. Path Sum | 1556A - A Variety of Operations |
136. Single Number | 169. Majority Element |
119. Pascal's Triangle II | 409. Longest Palindrome |
1574A - Regular Bracket Sequences | 1574B - Combinatorics Homework |