#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define ull unsigned long long
#define ld long double
#define bigint __int128
#define emb emplace_back
#define pb push_back
#define pii pair <int, int>
#define fi first
#define se second
#define all(v) v.begin(), v.end()
#define Task ""
#define MASK(k) (1ull << k)
#define bitcnt(k) __builtin_popcount(k)
#define testBit(n, k) ((n >> k) & 1)
#define flipBit(n, k) (n ^ (1ll << k))
#define offBit(n, k) (n & ~MASK(k))
#define onBit(n, k) (n | (1ll << k))
template <class T> bool minimize(T &a, T b) {if (a > b) {a = b; return true;} return false;}
template <class T> bool maximize(T &a, T b) {if (a < b) {a = b; return true;} return false;}
const int N = 1e6 + 5, LG = 20, mod = 1e9 + 7;
const ll INF = 1e18;
int n;
pii range[N];
namespace sub2 {
vector <int> adj[N];
int color[N];
bool dfs(int u, int c) {
color[u] = c;
for (int v: adj[u]) {
if (color[v] == color[u]) return false;
if (color[v] == 0) {
bool check = dfs(v, 3 - c);
if (!check) return false;
}
}
return true;
}
void solve() {
sort (range + 1, range + n + 1);
for (int u = 1; u <= n; u++) {
for (int v = u + 1; v <= n; v++) {
if (range[v].fi < range[u].se && range[u].se < range[v].se) {
adj[u].emplace_back(v);
adj[v].emplace_back(u);
}
}
}
int ans = 1;
for (int u = 1; u <= n; u++) if (!color[u]) {
bool check = dfs(u, 1);
if (!check) return (void)(cout << 0);
ans = ans * 2 % mod;
}
cout << ans;
}
}
namespace sub34 {
struct SegmentTree {
vector <int> st;
SegmentTree (int n) {
st.assign(n * 4 + 5, 1e9);
}
void update(int id, int l, int r, int p, int val) {
if (l == r) {
st[id] = val;
return;
}
int mid = (l + r) >> 1;
if (p <= mid) update(id << 1, l, mid, p, val);
else update(id << 1 | 1, mid + 1, r, p, val);
st[id] = min(st[id << 1], st[id << 1 | 1]);
}
int get(int id, int l, int r, int u, int v) {
if (u > r || v < l) return 1e9;
if (u <= l && r <= v) return st[id];
int mid = (l + r) >> 1;
return min(get(id << 1, l, mid, u, v), get(id << 1 | 1, mid + 1, r, u, v));
}
};
struct FenwickTree {
vector <int> bit;
FenwickTree (int len) {
bit.assign(len + 1, 0);
}
void update(int p, int val) {
for (; p < bit.size(); p += p & -p)
bit[p] += val;
}
int get(int p) {
int res = 0; for (; p > 0; p -= p & -p) res += bit[p];
return res;
}
int get(int l, int r) {
return get(r) - get(l - 1);
}
};
int have_edge[N];
int nearAffect[N], limit[N], spt[N][LG];
int minR(int l, int r) {
int k = __lg(r - l + 1);
return min(spt[l][k], spt[r - (1 << k) + 1][k]);
}
bool cmp(int u, int v) {
return range[u].se > range[v].se;
}
void solve() {
sort (range + 1, range + n + 1);
for (int i = 1; i <= n; i++) {
int low = i + 1, high = n, lim = -1;
while (low <= high) {
int mid = (low + high) >> 1;
if (range[mid].fi < range[i].se)
low = (lim = mid) + 1;
else high = mid - 1;
}
limit[i] = lim;
}
stack <int> st;
for (int i = n; i > 0; i--) {
while (!st.empty() && range[i].se > range[st.top()].se) st.pop();
nearAffect[i] = (st.empty() ? -1 : st.top());
if (nearAffect[i] > limit[i]) nearAffect[i] = -1;
st.emplace(i);
}
vector <int> order(n); iota(all(order), 1);
sort (all(order), cmp);
int components = n;
FenwickTree fen(n);
SegmentTree ST(n);
for (int i: order) {
fen.update(i, 1);
if (nearAffect[i] != -1) ST.update(1, 1, n, i, nearAffect[i]);
if (limit[i] != -1) {
int k = ST.get(1, 1, n, i + 1, limit[i]);
if (k <= limit[i]) return (void)(cout << 0);
// noi canh i->j (i < j <= limit[i] && B[i] < B[j])
components -= fen.get(i + 1, limit[i]);
}
}
int ans = 1;
for (int i = 1; i <= components; i++)
ans = ans * 2 % mod;
cout << ans;
}
}
int main() {
ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
if (fopen(Task".inp", "r")) {
freopen(Task".inp", "r", stdin);
freopen(Task".out", "w", stdout);
}
cin >> n;
for (int i = 1; i <= n; i++)
cin >> range[i].fi >> range[i].se;
if (n <= 2000) sub2::solve();
else sub34::solve();
}
