#include <bits/stdc++.h>
using namespace std;
int main() {
// cin.tie(0)->sync_with_stdio(0);
// cin.exceptions(cin.failbit);
int n;
cin >> n;
vector<pair<int, int>> vpii(n);
struct event {
int tim;
bool ins;
int val;
event() { tim = -1, ins = 0, val = -1; }
event(int a, int b, int c) { tim = a, ins = b, val = c; }
bool operator<(event x) const { return tim < x.tim; }
};
vector<event> times; // tim id
for (int i = 0; i < vpii.size(); i++) {
cin >> vpii[i].first >> vpii[i].second;
times.emplace_back(vpii[i].first, 1, i);
times.emplace_back(vpii[i].second, 0, i);
}
sort(times.begin(), times.end());
vector<int> dsu(2 * n);
iota(dsu.begin(), dsu.end(), 0);
function<int(int)> par = [&](int cur) {
if (dsu[cur] == cur)
return cur;
dsu[cur] = par(dsu[cur]);
return dsu[cur];
};
struct kun {
int head;
mutable pair<int, int> dura;
kun() { head = 0, dura = {0, 0}; }
kun(int a, int b, int c) { head = a, dura = {b, c}; }
bool operator<(kun x) const { return dura < x.dura; }
};
set<kun, less<>> spii; // tim, pile
for (auto a : times) {
// cout << a.tim << "\n";
// for (auto a : spii) {
// cout << a.head << " " << a.dura.first << " " << a.dura.second << "\n";
// }
if (!spii.empty()) {
spii.begin()->dura.first = max(spii.begin()->dura.first, a.tim + 1);
if (spii.begin()->dura.first > spii.begin()->dura.second) {
spii.erase(spii.begin());
}
}
if (a.ins) {
kun tmp(a.val, vpii[a.val].second, vpii[a.val].second);
auto it = spii.upper_bound(tmp);
if (it == spii.begin()) {
spii.insert(tmp);
continue;
}
kun tmp2;
while (1) {
if (it == spii.begin())
break;
it--;
dsu[par(it->head)] = par(tmp.head + n);
dsu[par(it->head + n)] = par(tmp.head);
tmp2.head = it->head;
tmp2.dura.second = max(tmp2.dura.second, it->dura.second);
tmp2.dura.first = it->dura.first;
it = spii.erase(it);
}
spii.insert(tmp2);
spii.insert(tmp);
}
}
for (int i = 0; i < n; i++)
if (par(i) == par(i + n)) {
cout << "0\n";
return 0;
}
set<int> si;
for (int i = 0; i < 2 * n; i++)
si.insert(par(i));
long long ans = 1;
const int MOD = 1e9 + 7;
for (int i = 0; i < si.size() / 2; i++) {
ans *= 2;
ans %= MOD;
}
cout << ans << "\n";
}
