#include <iostream>
#include <vector>
#include <map>
#include <string>
#include <utility>
#include <queue>
#include <stack>
#include <cmath>
#include <numeric>
#include <algorithm>
#include <iomanip>
#include <limits>

#define rep(i,j,k) for(int i=(int)j;i<(int)k;i++)
#define ll long long
#define all(v) ((v).begin(),(v).end())
#define Sort(v) sort(all(v))
#define INF 1000000000
using namespace std;
int day[12]={31,28,31,30,31,30,31,31,30,31,30,31};

int main(){
    int a,b;
    cin>>a>>b;
    //a^2+b^2=c^2
    //b^2=c^2-a^2

    double ans=0;
    ans=sqrt(a*a+b*b);

    if(a<b)swap(a,b);
    if(a!=b)ans=min(ans,sqrt(a*a-b*b));
    cout<<fixed<<setprecision(10);
    cout<<ans<<endl;

}