#include<bits/stdc++.h>
using namespace std;

int main(){
    int a,b;

    cin>>a>>b;

    if(a!=b)printf("%.10f\n", sqrt(pow(max(a,b),2)-pow(min(a,b),2)));
    else printf("%.10f\n", sqrt(a*a+b*b));
    return 0;
}