#include <bits/stdc++.h>

#define VARNAME(x) #x
#define show(x) cerr << #x << " = " << x << endl

using namespace std;
using ll = long long;
using ld = long double;

template <typename T>
ostream& operator<<(ostream& os, const vector<T>& v)
{
    os << "sz:" << v.size() << "\n[";
    for (const auto& p : v) {
        os << p << ",";
    }
    os << "]\n";
    return os;
}

template <typename S, typename T>
ostream& operator<<(ostream& os, const pair<S, T>& p)
{
    os << "(" << p.first << "," << p.second
       << ")";
    return os;
}


constexpr ll MOD = (ll)1e9 + 7LL;
constexpr ld PI = static_cast<ld>(3.1415926535898);

template <typename T>
constexpr T INF = numeric_limits<T>::max() / 10;

constexpr ld G = 0.001;
constexpr int MAX = 50;

constexpr ld X1[16] = {0, -0.5, 0, -0.5, 0, -0.5, 0, -0.5};
constexpr ld Y1[16] = {0, 0, -0.5, -0.5, 0, 0, -0.5, -0.5};
constexpr ld Z1[16] = {0, 0, 0, 0, -0.5, -0.5, -0.5, -0.5};

constexpr ld X2[16] = {-0.25, -0.75, -0.25, -0.75, -0.25, -0.75, -0.25, -0.75};
constexpr ld Y2[16] = {-0.25, -0.25, -0.75, -0.75, -0.25, -0.25, -0.75, -0.75};
constexpr ld Z2[16] = {-0.25, -0.25, -0.25, -0.25, -0.75, -0.75, -0.75, -0.75};

ld abs(const ld dx, const ld dy, const ld dz)
{
    return sqrt(dx * dx + dy * dy + dz * dz);
}

ld func(const ld x, const ld y, const ld z)
{
    ld sum = 0;
    for (int i = -MAX; i < MAX; i++) {
        for (int j = -MAX; j < MAX; j++) {
            for (int k = -MAX; k < MAX; k++) {
                if (x == 0 and y == 0 and z == 0 and i == 0 and j == 0 and k == 0) {
                    continue;
                }
                const ld l = abs(x - i, y - j, z - k);
                sum += 4 * PI * exp(-l * l / 4 / G / G) / l / l * cos(x * i + y * j + z * k);
                sum += 1 / l * erfc(G * l);
            }
        }
    }
    return sum;
}

int main()
{
    cin.tie(0);
    ios::sync_with_stdio(false);
    vector<ld> alpha(8);
    vector<ld> beta(8);
    for (int i = 0; i < 8; i++) {
        cin >> alpha[i];
    }
    for (int i = 0; i < 8; i++) {
        cin >> beta[i];
    }
    ld ans = 0;
    for (int i = 0; i < 8; i++) {
        ans += func(X1[i], Y1[i], Z1[i]) * alpha[i];
        ans += func(X2[i], Y2[i], Z2[i]) * beta[i];
    }
    cout << fixed << setprecision(15) << ans << endl;

    return 0;
}