/*
Telebe of Adicto && Mamedov yani AzeTurk810
I see humans but no humanity
*/
#include <algorithm>
#include <array>
#include <cassert>
#include <iostream>
#include <map>
#include <unordered_map>
#include <vector>
// mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
using ll = long long;
using namespace std;
#define ln '\n'
#define INFi 1e9
#define INFll 1e18
#define map unordered_map
#ifdef ONPC
#include <algo.hpp>
#else
#define dbg(...)
#define dbg_out(...)
#endif
constexpr ll MOD = 1e9 + 7, N = 505, M = N * 4;
int _n, _m;
vector<array<ll, 2>> V;
ll ans;
long long bp(long long a, long long b) {
long long res = 1;
while (b > 0) {
if (b & 1LL)
res = (res * a) % MOD;
a = (a * a) % MOD;
b >>= 1;
}
return res;
}
inline void systemd() {
V.resize(_n);
}
inline ll add(ll l, ll r) {
l += r;
while (l >= MOD) {
l -= MOD;
}
return l;
}
vector<ll> compsf;
map<ll, ll> compr, rev;
int compress() {
sort(compsf.begin(), compsf.end());
compsf.erase(unique(compsf.begin(), compsf.end()), compsf.end());
ll nxt = 0;
for (const ll &v : compsf) {
rev[nxt] = v;
compr[v] = nxt++;
}
return compsf.size();
}
ll mult(ll l, ll r) {
return (l * r) % MOD;
}
struct BIT {
int _n;
vector<ll> T;
BIT(int n) : _n(n), T(_n + 1, 0) {
}
void upd(int i, ll x) {
i ++;
while (i <= _n) {
dbg(i);
T[i] = add(T[i], x);
i += i & -i;
}
}
ll sum(int l, int r) {
if (l != 1) {
return sum(1, r) - sum(1, l - 1);
}
r++;
ll res = 0;
while (r > 0) {
res = add(res, T[r]);
r -= (r) & (-r);
}
return res;
}
};
char solve() {
if (!(cin >> _n))
return 1;
systemd();
for (auto &[a, b] : V) {
cin >> a >> b;
compsf.push_back(a);
// compsf.push_back(a - 1);
compsf.push_back(b);
// compsf.push_back(b - 1);
}
_m = compress();
BIT t(_m + 2);
for (int i = 0; i < _n; i++) {
int l = compr[V[i][0]], r = compr[V[i][1]];
vector<pair<int, ll>> updates;
for (int x = l; x <= r; x++) {
ll ways = 1;
if (x > 0) {
ways = add(ways, t.sum(1, x - 1));
}
updates.push_back({x, ways});
}
for (auto &[pos, val] : updates) {
t.upd(pos, val);
}
}
cout << t.sum(1, _m - 1) << ln;
return 0;
}
// Attack on titan<3
signed main() {
ios::sync_with_stdio(0);
cin.tie(nullptr);
int t = 1e9;
// cin >> t;
for (int cases = 0; cases < t; cases++) {
if (solve())
break;
#ifdef ONPC
cerr << "__________\n";
#endif
}
}
// Just Imaginary
/*
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⣀⣀⠀⠀⠀⢀⣴⣾⠀⠀⠀⡀⢀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢸⣿⣿⣿⣦⣾⣿⣿⣿⣿⣿⡆⠁⠀⢀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠹⣿⣿⣿⣿⣿⣿⣿⣿⡿⠁⠀⡠⠂⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣀⠠⠔⠚⣿⣿⣿⣿⣿⣦⡄⠀⠁⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⢀⠠⠐⢂⠉⡀⣀⣤⣄⢻⣿⣿⡟⢈⡹⣿⡀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⡀⠄⠂⠈⠀⣶⣤⣾⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⠘⣷⡀⠀⡀⠐⠂⠐⢄
⠀⠀⠀⠀⠀⠀⠀⣿⣿⠟⠿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣧⣀⣾⣷⠯⠀⠤⠤⠄⠈
⠀⠀⠀⠀⠀⠀⣼⣿⡟⠀⠀⣹⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣷⣄⡀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⣰⣿⠋⠀⠀⢠⣾⣿⣿⣿⣿⣿⣭⠟⢻⣿⣿⣿⣿⡿⠁⠀⠀⠀⠀
⠀⠀⠀⣀⣶⡟⠁⠀⢾⣶⣿⠟⠉⠈⢻⣿⣿⣿⣦⣜⠀⠛⠛⠿⠁⠀⠀⠀⠀⠀
⠚⠻⠿⠿⡿⠁⠀⢠⣿⣿⠁⠀⣠⠖⠋⠉⠻⣿⣿⣿⣶⡀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⣰⣿⡿⠃⠠⠊⠁⠀⠀⠀⠀⠈⢿⣿⣿⠟⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⢀⣴⡿⠋⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠘⠁⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⣠⣾⠏⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⢀⣴⠾⠟⠛⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
*/
