//Normal

#define _GLIBCXX_DEBUG
#define ll long long
#include <bits/stdc++.h>
using namespace std;
using Graph = vector<vector<int>>;

void print(auto a){
  cout << a;
}

void prints(auto a){
  cout << a << " ";
}

void prints(){
  cout << " ";
}

void printl(auto a){
  cout << a << endl;
}

void printl(){
  cout << endl;
}

void fix(int n){
  cout << fixed << setprecision(n);
}

int siz(string s){
  return (int)s.size();
}

int main(){
  double A, B; cin >> A >> B;
  if(A > B) swap(A, B);

  double ng = 0.0, ok = 1000.0;
  while(ng+1e-9 < ok){
    double mid = (ng+ok)/2.0;

    double sum = sqrt(mid*mid + A*A);
    B <= sum ? ok = mid : ng = mid;
  }

  fix(10);
  printl(ok);

  return 0;
}