#define _CRT_SECURE_NO_WARNINGS
#include<sstream>
#include<iostream>
#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<climits>
#include<cmath>
#include<string>
#include<vector>
#include<set>
#include<map>
#include<queue>
#include<numeric>
#include<functional>
#include<algorithm>
#include<bitset>
#include<tuple>
#include<unordered_set>
#include<random>
using namespace std;
#define INF (1<<29)
#define rep(i,n) for(int i=0;i<(int)(n);i++)
#define all(v) v.begin(),v.end()
#define uniq(v) v.erase(unique(all(v)),v.end())
#define indexOf(v,x) (find(all(v),x)-v.begin())


int main() {
	ios::sync_with_stdio(0);
	cin.tie(0);
	double xa,ya,xb,yb;
	cin>>xa>>ya>>xb>>yb;
	double ansd=1e+10;
	rep(y,1000){
		double d= sqrt((xa)*(xa)+(ya-y)*(ya-y))+sqrt(xa*xa+(yb-y)*(yb-y));
		if(ansd>d){
			ansd=d;
		}
	}
	printf("%.10f\n",ansd);
	return 0;
}