///
#define _CRT_SECURE_NO_WARNINGS
#include <bits/stdc++.h>
//#include "temp.cpp"
#include <cstdio>
using namespace std;
#ifndef ONLINE_JUDGE
#define dbg(x) cerr << #x <<" "; print(x); cerr << endl;
#else
#define dbg(x)
#endif
#define sz(x) (int)x.size()
#define len(x) (int)x.length()
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define clr(x) (x).clear()
#define uniq(x) x.resize(unique(all(x)) - x.begin());
#define blt __builtin_popcount
#define pb push_back
#define popf pop_front
#define popb pop_back
#define ld long double
void print(long long t) {cerr << t;}
void print(int t) {cerr << t;}
void print(string t) {cerr << t;}
void print(char t) {cerr << t;}
void print(double t) {cerr << t;}
void print(long double t) {cerr << t;}
void print(unsigned long long t) {cerr << t;}
template <class T, class V> void print(pair <T, V> p);
template <class T> void print(vector <T> v);
template <class T> void print(set <T> v);
template <class T, class V> void print(map <T, V> v);
template <class T> void print(multiset <T> v);
template <class T, class V> void print(T v[],V n) {cerr << "["; for(int i = 0; i < n; i++) {print(v[i]); cerr << " "; } cerr << "]";}
template <class T, class V> void print(pair <T, V> p) {cerr << "{"; print(p.first); cerr << ","; print(p.second); cerr << "}";}
template <class T> void print(vector <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
template <class T> void print(set <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
template <class T> void print(multiset <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
template <class T, class V> void print(map <T, V> v) {cerr << "[ "; for (auto i : v) {print(i); cerr << " ";} cerr << "]";}
template <class T> void print(deque <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
#define nl '\n'
// for random generations
// mt19937 myrand(chrono::steady_clock::now().time_since_epoch().count());
mt19937 myrand(373);
// for grid problems
int dx[8] = {-1,0,1,0,1,-1,1,-1};
int dy[8] = {0,1,0,-1,1,1,-1,-1};
// lowest / (1 << 17) >= 1e5 / (1 << 18) >= 2e5 / (1 << 21) >= 1e6
void fastIO() {
ios_base::sync_with_stdio(false);
cin.tie(nullptr); cout.tie(nullptr);
}
// file in/out
void setIO(string str = "") {
fastIO();
if(str == "input") {
freopen("input.txt", "r", stdin);
freopen("output.txt", "w", stdout);
} else {
// freopen("skis.in", "r", stdin);
// freopen("skis.out", "w", stdout);
}
}
// Indexed Set
template <class T> using Tree = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
const long long mod = 1e9 + 7;
const int N = 2e6 + 10;
vector<int> adj[N];
int st[N], en[N];
int vis[N];
int n;
void dfs(int node, int parent) {
for(auto i: adj[node]) {
if(vis[i]) {
if(vis[i] != 3 - vis[node]) {
cout << 0 << '\n';
exit(0);
}
continue;
}
vis[i] = 3 - vis[node];
dfs(i, node);
}
}
// dsu
int p[3 * N], sz[3 * N];
void init() {
for(int i = 1; i <= 2 * n; i++) {
p[i] = i, sz[i] = 1;
}
}
int find(int a) {
if(a != p[a]) {
p[a] = find(p[a]);
}
return p[a];
}
int same(int a, int b) {
if(find(a) == find(b)) {
return 1;
}
return 0;
}
int merge(int a, int b) {
a = find(a), b = find(b);
if(a == b) {
return 0;
}
if(sz[b] > sz[a]) {
swap(a, b);
}
p[b] = a, sz[a] += sz[b];
return 1;
}
long long binPowByMod(long long a, long long b) {
a %= mod;
long long res = 1;
while (b > 0) {
if (b & 1)
res = res * a % mod;
a = a * a % mod;
b >>= 1;
}
return res;
}
void solve_() {
cin >> n;
vector<pair<int, int>> vec;
for(int i = 1; i <= n; i++) {
int a, b; cin >> a >> b;
st[a] = i;
en[b] = i;
//
vec.emplace_back(a, b);
}
init();
sort(all(vec));
set<pair<int, int>> st;
for(int i = 0; i < n; i++) {
while(!st.empty() && st.begin()->first < vec[i].first) {
st.erase(st.begin());
}
auto it = st.upper_bound({vec[i].second, -1});
for(auto j = st.begin(); j != it; j++) {
merge(j->second, i + n);
merge(j->second + n, i);
if(same(j->second, prev(it)->second)) break;
}
st.insert({vec[i].second, i});
}
set<int> stik;
for(int i = 0; i < n; i++) {
if(same(i, i + n)) {
cout << 0 << '\n';
return;
}
}
int c = 0;
for(int i = 0; i < 2 * n; i++) {
if(find(i) == i) {
c++;
}
}
cout << binPowByMod(2, c / 2) << '\n';
}
int main() {
setIO();
auto solve = [&](int test_case)-> void {
for(int i = 1; i <= test_case; i++) {
solve_();
}
};
int test_cases = 1;
// cin >> test_cases;
solve(test_cases);
return 0;
}
