#include<bits/stdc++.h>
bool Mbg;
using namespace std;
#define vec vector
#define pb push_back
#define eb emplace_back
#define siz(vec) ((int)(vec).size())
#define all(vec) (vec).begin(),(vec).end()
template<class T>
void operator +=(vec<T> &a,T b){a.push_back(b);}
template<class T>
void operator --(vec<T> &a){a.pop_back();}
#define pii pair<int,int>
#define x first
#define y second
#define mp make_pair
#define exc(exp) if(exp)continue;
#define stop(exp) if(exp)break;
#define ret(exp) if(exp)return;
#define deb(var) cerr<<#var<<'='<<(var)<<"; "
#define debl(var) cerr<<#var<<'='<<(var)<<";\n"
#define ins insert
#define era erase
#define lb lower_bound
#define ub upper_bound
#define int long long
#define inf (long long)(1e18)
template<class T>
bool Min(T &x,T y){return x>y?x=y,1:0;}
template<class T>
bool Max(T &x,T y){return x<y?x=y,1:0;}
const int mod=998244353;
void Add(int &x,int y){x=x+y<mod?x+y:x+y-mod;}
void Dec(int &x,int y){x=x>=y?x-y:x-y+mod;}
int fpm(int x,int y){
    int ans=1;for(;y;y>>=1,x=1ll*x*x%mod)if(y&1)ans=1ll*x*ans%mod;return ans;
}
mt19937 eng(random_device{}());

bitset<51> bt[1010];

int n,p[1010];
int x[1010][26];

int Q;

int ask(int i,int j){
    if(i==j){
        return 0;
    }
    cout<<i<<' '<<j<<endl;

    // ++Q;
    // if(Q>25000)assert(0);
    // int d=(bt[i]^bt[j]).count();

    int d;
    cin>>d;

    if(!d)exit(0);
    return d;
}

void work(){
    cin>>n;

    for(int i=1;i<n;i++){
        for(int j=0;j<50;j++){
            bt[i][j]=eng()&1;
        }
    }
    bt[n]=bt[eng()%(n-1)+1];

    iota(p+1,p+n+1,1);
    shuffle(p+1,p+n+1,eng);

    int d=min(24ll,n);

    for(int i=1;i<=n;i++){
        for(int j=1;j<=d;j++){
            x[i][j]=ask(i,p[j]);
        }
    }

    for(int i=1;i<=n;i++){
        for(int j=i+1;j<=n;j++){
            bool fl=1;
            for(int k=1;k<=d;k++){
                fl&=x[i][k]==x[j][k];
            }
            if(fl)ask(i,j);
        }
    }

    assert(0);
}
bool Med;
signed main(){
    int T=1;while(T--)work();
    // cerr<<"Time: "<<clock()<<" ms;\n";
    // cerr<<"Memory: "<<abs(&Med-&Mbg)/1024.0/1024.0<<" MiB.\n";
}
/*
- CONTINUE, NON-STOPPING, FOR THE FAITH
- START TYPING IF YOU DON'T KNOW WHAT TO DO
- STOP TYPING IF YOU DON'T KNOW WHAT YOU'RE DOING
*/