#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (n); i++)
#define per(i, n) for (int i = (n)-1; i >= 0; i--)
#define rep2(i, l, r) for (int i = (l); i < (r); i++)
#define per2(i, l, r) for (int i = (r)-1; i >= (l); i--)
#define each(e, v) for (auto &e : v)
#define MM << " " <<
#define pb push_back
#define eb emplace_back
#define all(x) begin(x), end(x)
#define rall(x) rbegin(x), rend(x)
#define sz(x) (int)x.size()
using ll = long long;
using pii = pair<int, int>;
using pil = pair<int, ll>;
using pli = pair<ll, int>;
using pll = pair<ll, ll>;

template <typename T>
using minheap = priority_queue<T, vector<T>, greater<T>>;

template <typename T>
using maxheap = priority_queue<T>;

template <typename T>
bool chmax(T &x, const T &y) {
    return (x < y) ? (x = y, true) : false;
}

template <typename T>
bool chmin(T &x, const T &y) {
    return (x > y) ? (x = y, true) : false;
}

template <typename T>
int flg(T x, int i) {
    return (x >> i) & 1;
}

int pct(int x) { return __builtin_popcount(x); }
int pct(ll x) { return __builtin_popcountll(x); }
int topbit(int x) { return (x == 0 ? -1 : 31 - __builtin_clz(x)); }
int topbit(ll x) { return (x == 0 ? -1 : 63 - __builtin_clzll(x)); }
int botbit(int x) { return (x == 0 ? -1 : __builtin_ctz(x)); }
int botbit(ll x) { return (x == 0 ? -1 : __builtin_ctzll(x)); }

template <typename T>
void print(const vector<T> &v, T x = 0) {
    int n = v.size();
    for (int i = 0; i < n; i++) cout << v[i] + x << (i == n - 1 ? '\n' : ' ');
    if (v.empty()) cout << '\n';
}

template <typename T>
void printn(const vector<T> &v, T x = 0) {
    int n = v.size();
    for (int i = 0; i < n; i++) cout << v[i] + x << '\n';
}

template <typename T>
int lb(const vector<T> &v, T x) {
    return lower_bound(begin(v), end(v), x) - begin(v);
}

template <typename T>
int ub(const vector<T> &v, T x) {
    return upper_bound(begin(v), end(v), x) - begin(v);
}

template <typename T>
void rearrange(vector<T> &v) {
    sort(begin(v), end(v));
    v.erase(unique(begin(v), end(v)), end(v));
}

template <typename T>
vector<int> id_sort(const vector<T> &v, bool greater = false) {
    int n = v.size();
    vector<int> ret(n);
    iota(begin(ret), end(ret), 0);
    sort(begin(ret), end(ret), [&](int i, int j) { return greater ? v[i] > v[j] : v[i] < v[j]; });
    return ret;
}

template <typename T>
void reorder(vector<T> &a, const vector<int> &ord) {
    int n = a.size();
    vector<T> b(n);
    for (int i = 0; i < n; i++) b[i] = a[ord[i]];
    swap(a, b);
}

template <typename T>
T floor(T x, T y) {
    assert(y != 0);
    if (y < 0) x = -x, y = -y;
    return (x >= 0 ? x / y : (x - y + 1) / y);
}

template <typename T>
T ceil(T x, T y) {
    assert(y != 0);
    if (y < 0) x = -x, y = -y;
    return (x >= 0 ? (x + y - 1) / y : x / y);
}

template <typename S, typename T>
pair<S, T> operator+(const pair<S, T> &p, const pair<S, T> &q) {
    return make_pair(p.first + q.first, p.second + q.second);
}

template <typename S, typename T>
pair<S, T> operator-(const pair<S, T> &p, const pair<S, T> &q) {
    return make_pair(p.first - q.first, p.second - q.second);
}

template <typename S, typename T>
istream &operator>>(istream &is, pair<S, T> &p) {
    S a;
    T b;
    is >> a >> b;
    p = make_pair(a, b);
    return is;
}

template <typename S, typename T>
ostream &operator<<(ostream &os, const pair<S, T> &p) {
    return os << p.first << ' ' << p.second;
}

struct io_setup {
    io_setup() {
        ios_base::sync_with_stdio(false);
        cin.tie(NULL);
        cout << fixed << setprecision(15);
        cerr << fixed << setprecision(15);
    }
} io_setup;

constexpr int inf = (1 << 30) - 1;
constexpr ll INF = (1LL << 60) - 1;
// constexpr int MOD = 1000000007;
constexpr int MOD = 998244353;

void solve() {
    int N;
    cin >> N;

    vector<int> a(N);

    rep(i, N) {
        cin >> a[i];
        // if (a[i] == 1) {
        //     cout << 0 << '\n';
        //     return;
        // }
    }

    auto get = [&](ll x, ll y) {
        ll g = gcd(x, y);
        if (g >= 2) return 0LL;
        if (x == 0 || y == 0) return 0LL;
        return (x - 1) * (y - 1);
    };

    auto ans = [&](int i, int j) { cout << i + 1 MM j + 1 << '\n'; };

    if (N >= 4) {
        vector<int> odd, even;
        rep(i, N) {
            (a[i] & 1 ? odd : even).eb(i); //
        }

        cout << 0 << '\n';

        if (sz(even) >= 2) {
            ans(even[0], even[1]);
            rep(i, N - 2) ans(N - 3 - i, N - 2 - i);
        } else if (sz(odd) >= 4) {
            ans(odd[2], odd[3]);
            ans(odd[0], odd[1]);
            rep(i, N - 3) ans(N - 4 - i, N - 3 - i);
        } else {
            assert(sz(odd) == 3 && sz(even) == 1);
            ans(odd[1], odd[2]);
            int p = even[0];
            rep2(i, 1, 3) {
                if (odd[i] < even[0]) p--;
            }
            ans(p, N - 2);
            ans(0, 1);
        }
        return;
    }

    if (N == 2) {
        cout << get(a[0], a[1]) << '\n';
        ans(0, 1);
        return;
    }

    if (N == 3) {
        ll mi = INF;
        int id = -1;

        rep(i, N) {
            int j = (i + 1) % 3, k = (i + 2) % 3;
            ll x = get(a[j], a[k]);
            ll y = get(a[i], x);
            if (chmin(mi, y)) id = i;
        }

        cout << mi << '\n';
        int i = id;
        int j = (i + 1) % 3, k = (i + 2) % 3;
        ans(j, k);
        ans(0, 1);
        return;
    }
}

int main() {
    int T = 1;
    // cin >> T;
    while (T--) solve();
}