#include <iostream>
#include <math.h>
#include <stdlib.h>
using namespace std;

int main(){
	double a,b;
	cin >> a >> b;
	if ( a == b)
	cout << sqrt( a*a + b*b) << endl;
	else
	cout << min(sqrt(a*a + b*b),sqrt(abs(a*a - b*b))) << endl;
	return 0;
	}