#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
  #include "settings/debug.cpp"
#else
  #define Debug(...) void(0)
#endif
#define rep(i, n) for (int i = 0; i < (n); ++i)
using ll = long long;
using ull = unsigned long long;

int main() {
  cin.tie(nullptr)->sync_with_stdio(false);
  int a, b;
  cin >> a >> b;
  if (a < b) swap(a, b);
  long double x = sqrtl(a * a + b * b);
  long double y = sqrtl(a * a - b * b);
  cout << fixed << setprecision(15) << min(x, y) << '\n';
  return 0;
}