#include "bits/stdc++.h"
#define _CRT_SECURE_NO_WARNINGS
#define rep(i,n) for(int i = 0;i < n;i++)
#define REP(i,n,k) for(int i = n;i < k;i++)
#define P(p) cout << (p) << endl;
#define sP(p) cout << setprecision(15) << fixed << p << endl;
#define Pi pair<int,int>
#define IINF 1e9
#define LINF 1e18
#define vi vector<int>
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
int dx[] = { 0, 1,0,-1 };
int dy[] = { 1, 0,-1,0 };

ll comb(ll n, ll k) {
	ll ans = 1;
	for (ll i = 0; i < k; i++) {
		ans *= n - i;
		ans /= i + 1;
	}
	return ans;
}

void solve() {
	double a, b;
	cin >> a >> b;
	double ans;
	if (a != b) {
		ans = sqrt(pow(max(a, b), 2) - pow(min(a, b), 2));
	}
	else {
		ans = sqrt(pow(a, 2) + pow(b, 2));
	}
	sP(ans);
}

int main() {
	solve();
	return 0;
}