#include using namespace std; #define REP(i, n) for (int i=0; i<(n); ++i) #define RREP(i, n) for (int i=(int)(n)-1; i>=0; --i) #define FOR(i, a, n) for (int i=(a); i<(n); ++i) #define RFOR(i, a, n) for (int i=(int)(n)-1; i>=(a); --i) #define SZ(x) ((int)(x).size()) #define ALL(x) (x).begin(),(x).end() #define DUMP(x) cerr<<#x<<" = "<<(x)< ostream &operator<<(ostream &os, const vector &v) { os << "["; REP(i, SZ(v)) { if (i) os << ", "; os << v[i]; } return os << "]"; } template ostream &operator<<(ostream &os, const pair &p) { return os << "(" << p.first << " " << p.second << ")"; } template bool chmax(T &a, const T &b) { if (a < b) { a = b; return true; } return false; } template bool chmin(T &a, const T &b) { if (b < a) { a = b; return true; } return false; } using ll = long long; using ull = unsigned long long; using ld = long double; using P = pair; using vi = vector; using vll = vector; using vvi = vector; using vvll = vector; const ll MOD = 1e9 + 7; const int INF = INT_MAX / 2; const ll LINF = LLONG_MAX / 2; const ld eps = 1e-9; int main() { cin.tie(0); ios::sync_with_stdio(false); cout << fixed << setprecision(10); ll a, b; cin >> a >> b; a = abs(a); b = abs(b); ll g = gcd(a, b); if(a == 0 && b == 0) { cout << 0.25 << endl; return 0; } else if(a == 0 || b == 0) { if(a == 0) swap(a, b); ld ans = 0.0; for(ll i = 1;i<=15;i+=a) { ans += 1.0 / pow(i+1, i+1); } cout << ans << endl; return 0; } else if((a / g & 1) ^ (b / g & 1) == 0) { ld ans = 0.0; for(ll i = 1;i<=15;i+=g) { for(ll j = 1;j<=15;j+=g) { if(((i-1) / g + (j-1) / g) % 2 == 0) { ans += 1.0 / pow(i+j, i+j); } } } cout << ans << endl; return 0; } ld ans = 0.0; for(ll i = 1;i<=15;i+=g) { for(ll j = 1;j<=15;j+=g) { if(i + j > 15) break; ans += 1.0 / pow(i + j, i + j); } } cout << ans << endl; return 0; }