#include<bits/stdc++.h>

#define REP(i,s,n) for(int i=s;i<n;++i)
#define rep(i,n) REP(i,0,n)
#define EPS (1e-8)
#define equals(a,b) (fabs((a)-(b))<EPS)

using namespace std;

typedef long long ll;

double is_ab(ll b,ll c) {
  ll a = c * c - b * b;
  if( a <= 0LL ) return DBL_MAX;
  return sqrt(a);
}

double is_c(ll a,ll b) {
  ll c = a * a + b * b;
  return sqrt(c);
}


int main() {
  ll a,b;
  double c = DBL_MAX;
  cin >> a >> b;
  // a
  c = min(c,min(is_ab(a,b),is_ab(b,a)));
  c = min(c,min(is_c(a,b) ,is_c(b,a)));
  printf("%.10f\n",c);
  return 0;
}