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;
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