#include "bits/stdc++.h"
using namespace std;
const int K = 316;
const int MOD = 1e9 + 7;
int main() {
ios::sync_with_stdio(0), cin.tie(0);
int n; cin >> n;
vector<pair<int, int>> a(n);
for (auto &[x, y] : a)
cin >> x >> y;
vector sum(K, vector<long long>(K));
vector<long long> dp(n);
for (int i = n - 1; i >= 0; i--) {
auto [d, x] = a[i];
dp[i] = 1;
if (d > 0) {
if (d < K)
dp[i] = (dp[i] + sum[d][i % d]) % MOD;
else {
for (int j = i + d; j < n; j += d)
dp[i] = (dp[i] + dp[j]) % MOD;
}
}
for (int k = 1; k < K; k++)
sum[k][i % k] = (sum[k][i % k] + dp[i]) % MOD;
}
cout << dp[0] << '\n';
return 0;
}
