#include <bits/stdc++.h>
using namespace std;
#include <atcoder/all>
using namespace atcoder;
#define rep(i, n) for(int i=0;i<(n);++i)
#define rep1(i, n) for(int i=1;i<=(n);i++)
#define ll long long
using mint = modint998244353;
using P = pair<ll,ll>;
using lb = long double;
using T = tuple<ll, ll, ll>;
#ifdef LOCAL
#  include <debug_print.hpp>
#  define dbg(...) debug_print::multi_print(#__VA_ARGS__, __VA_ARGS__)
#else
#  define dbg(...) (static_cast<void>(0))
#endif

int main()
{
    int n;
    cin >> n;
    vector<ll> a(n);
    rep(i,n) cin >> a[i];
    vector<int> vs;
    rep(i,n){
        if(a[i]==0 || a[i]==1){
            cout << 0 << endl;
            cout << i + 1 << " " << (i+1)%n+1 << endl;
            for(int j=n-1;j>=2;j--){
                cout << j << " " << 1 << endl;
            }
            return 0;
        }
    }
    rep(i,n) if(a[i]%2==0) vs.push_back(i);
    if(vs.size()>=2){
        cout << 0 << endl;
        cout << vs[0] +1 << " " << vs[1] + 1 << endl;
        for(int j=n-1;j>=2;j--){
            cout << j << " " << 1 << endl;
        }
        return 0;
    }
    vector<int> odd;
    rep(i,n) if(a[i]%2) odd.push_back(i);
    if(odd.size()>=4){
        cout << 0 << endl;
        cout << odd[0]+1 << " " << odd[1] + 1 << endl;
        cout << odd[2] + 1 -2 << " " << odd[3] + 1 -2 << endl;
        for(int j=n-2;j>=2;j--){
            cout << j << " " << 1 << endl;
        }
        return 0;
    }
    if(odd.size()>=2 && vs.size()==1){
        cout << 0 << endl;
        cout << odd[0] + 1 << " " << odd[1] + 1 << endl;
        vector<int> v;
        rep(i,n){
            if(i==odd[0] || i==odd[1]){
                continue;
            }
            v.push_back(a[i]);
        }
        rep(i,n-2){
            if(v[i]%2==0) {
                cout << i + 1 << " " << n-1 << endl;
                break;
            }
        }
        for(int j=n-2;j>=2;j--){
            cout << j << " " << 1 << endl;
        }
        return 0;
    }
    if(n==2){
        cout << a[0]*a[1] - a[0] - a[1] + 1 << endl;
        cout << 1 << " " << 2 << endl;
    }
    return 0;
}