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codeforces#320C
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codeforces#320C
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#include <cstdio>
#include <iostream>
#include <cmath>
using namespace std;
#define INF 1000000001.0
int main(){
int a,b;
cin >> a >> b;
int x = a-b;
int y = a+b;
double ans = INF;
if(a > b){
int c = floor(x/b);
if(c > 0){
if(c&1){
if(c > 1)
ans = x*1.0/(c-1);
}
else{
ans = x * 1.0 /c;
}
}
c = floor(y/b);
if(c & 1){
if(c >= 3){
ans = min(ans,y*1.0/(c-1));
}
}
else{
if(y >= 2)
ans = min(ans,y*1.0/c);
}
if(ans < INF)
printf("%.11f\n",ans);
else{
printf("%.11f\n",-1.0);
}
}
else if(a == b){
printf("%d\n",a);
}
else{
cout << -1 << endl;
}
return 0;
}#include <cstdio>
#include <iostream>
#include <cmath>
using namespace std;
#define INF 1000000001.0
int main(){
int a,b;
cin >> a >> b;
int x = a-b;
int y = a+b;
double ans = INF;
if(a > b){
int c = floor(x/b);
if(c > 0){
if(c&1){
if(c > 1)
ans = x*1.0/(c-1);
}
else{
ans = x * 1.0 /c;
}
}
c = floor(y/b);
if(c & 1){
if(c >= 3){
ans = min(ans,y*1.0/(c-1));
}
}
else{
if(y >= 2)
ans = min(ans,y*1.0/c);
}
if(ans < INF)
printf("%.11f\n",ans);
else{
printf("%.11f\n",-1.0);
}
}
else if(a == b){
printf("%d\n",a);
}
else{
cout << -1 << endl;
}
return 0;
}