#include<cstdio>
#include<iostream>
#include<algorithm>
#include<string>
#include<queue>
#include<vector>
#include<functional>
#include<cmath>
#include<map>
#include<stack>
#include<set>
#include<numeric>

using namespace std;
typedef long long ll;
typedef pair<ll, ll> pl;

int main()
{
	int a, b;
	cin >> a >> b;

	int A, B,ans;
	if (a != b) {
		A = max(a, b);
		B = min(a, b);
		ans = A*A - B*B;
	}
	else 
		ans = a*a + b*b;
	
	printf("%.20f\n",sqrt(ans));
	return 0;
}