#include <iostream>
#include <vector>
#include <cmath>
using namespace std;
using ll = long long;
int main() {
int n;
cin >> n;
ll total = 0, mn = 0;
while (n--) {
ll a, b;
cin >> a >> b;
total += a * b;
mn = max(mn, b);
}
vector<int> ans;
for (int i = mn; i * i <= total; i++) {
if (total % i == 0) {
ans.push_back(i);
}
}
cout << ans.size() << '\n';
for (auto i : ans) {
cout << i << '\n';
}
}
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