#include<bits/stdc++.h>
 using namespace std;
#define INF 1000000000
#define REP(i,n) for(int (i)=0;(i)<(int)(n);(i)++)
typedef long long LL;
double a,b;
int main(){
    cin>>a>>b;
    if(a!=b){
    cout<<setprecision(10)<<sqrt(max(a,b)*max(a,b)-min(a,b)*min(a,b))<<endl;;
    }else{
    cout<<setprecision(10)<<sqrt(max(a,b)*max(a,b)+min(a,b)*min(a,b))<<endl;;
    }
    return 0;
}