#define rep(i, n) for (int i = 0; i < (int)(n); i++) #define ALL(v) v.begin(), v.end() typedef long long ll; #include using namespace std; int main(){ ll a,b; cin>>a>>b; a=abs(a); b=abs(b); if(a==0 && b==0) cout<<0.25<10) break; ans+=1.0/(double)pow(2+b*i,2+b*i); } cout<10) break; ans+=1.0/(double)pow(a*i+2,a*i+2); } cout<100){ cout<<0.25<10) continue; ans+=1.0/(double)pow(2+g*(i+j),2+g*(i+j)); } } cout<