#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define int ll
const int MOD = 1e9 + 7;
void run() {
int n;
cin >> n;
vector<int> a(n), b(n);
for (int i = 0; i < n; ++i) {
cin >> a[i] >> b[i];
assert(a[i] == b[i]);
}
vector<int> dp(n, 1);
for (int i = 0; i < n; ++i) {
for (int j = 0; j < i; ++j) {
if (a[i] > a[j]) {
dp[i] += dp[j];
}
}
dp[i] %= MOD;
}
int ans = 0;
for (int i = 0; i < n; ++i) {
ans += dp[i];
}
ans %= MOD;
cout << ans << '\n';
}
signed main() {
ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
run();
}
