#include "bits/stdc++.h"
using namespace std;
typedef long long ll;
typedef pair<ll, ll> pll;
typedef vector<ll> vll;
const ll N = 1e6 + 5, mod = 1e9 + 7;
ll n, l[N], r[N], used[N], fl;
vll g[N];
void dfs(ll v) {
for (auto x: g[v]) {
if (used[x]) {
if (used[x] == used[v]) fl = 0;
} else used[x] = 3 - used[v], dfs(x);
}
}
signed main() {
ios::sync_with_stdio(0), cin.tie(0), cout.tie(0);
cin >> n;
for (ll i = 0; i < n; i++) cin >> l[i] >> r[i];
for (ll i = 0; i < n; i++) {
for (ll j = i + 1; j < n; j++) {
if (l[i] < l[j]) {
if (r[i] > l[j] && r[i] < r[j]) g[i].push_back(j), g[j].push_back(i);
} else {
if (r[j] > l[i] && r[j] < r[i]) g[i].push_back(j), g[j].push_back(i);
}
}
}
ll ans = 1;
for (ll i = 0; i < n; i++) {
if (used[i]) continue;
used[i] = 1;
fl = 1;
dfs(i);
ans = (ans * fl * 2) % mod;
}
cout << ans;
}
