#define _USE_MATH_DEFINES
#include <bits/stdc++.h>
using namespace std;
#define FOR(i,m,n) for(int i=(m);i<(n);++i)
#define REP(i,n) FOR(i,0,n)
#define ALL(v) (v).begin(),(v).end()
using ll = long long;
constexpr int INF = 0x3f3f3f3f;
constexpr long long LINF = 0x3f3f3f3f3f3f3f3fLL;
constexpr double EPS = 1e-8;
constexpr int MOD = 998244353;
// constexpr int MOD = 1000000007;
constexpr int DY4[]{1, 0, -1, 0}, DX4[]{0, -1, 0, 1};
constexpr int DY8[]{1, 1, 0, -1, -1, -1, 0, 1};
constexpr int DX8[]{0, -1, -1, -1, 0, 1, 1, 1};
template <typename T, typename U>
inline bool chmax(T& a, U b) { return a < b ? (a = b, true) : false; }
template <typename T, typename U>
inline bool chmin(T& a, U b) { return a > b ? (a = b, true) : false; }
struct IOSetup {
  IOSetup() {
    std::cin.tie(nullptr);
    std::ios_base::sync_with_stdio(false);
    std::cout << fixed << setprecision(20);
  }
} iosetup;

std::vector<int> prime_sieve(const int n, const bool get_only_prime) {
  std::vector<int> smallest_prime_factor(n + 1), prime;
  std::iota(smallest_prime_factor.begin(), smallest_prime_factor.end(), 0);
  for (int i = 2; i <= n; ++i) {
    if (smallest_prime_factor[i] == i) [[unlikely]] prime.emplace_back(i);
    for (const int p : prime) {
      if (i * p > n || p > smallest_prime_factor[i]) break;
      smallest_prime_factor[i * p] = p;
    }
  }
  return get_only_prime ? prime : smallest_prime_factor;
}

struct OsaK {
  const std::vector<int> smallest_prime_factor;

  explicit OsaK(const int n) : smallest_prime_factor(prime_sieve(n, false)) {}

  std::vector<std::pair<int, int>> query(int n) const {
    std::vector<std::pair<int, int>> res;
    while (n > 1) {
      const int prime = smallest_prime_factor[n];
      int exponent = 0;
      for (; smallest_prime_factor[n] == prime; n /= prime) {
        ++exponent;
      }
      res.emplace_back(prime, exponent);
    }
    return res;
  }
};

int main() {
  constexpr int P = 10000000;
  int k; cin >> k;
  int nums[P]{}, p_k = 0, nonzero = k;
  while (k--) {
    int p, e; cin >> p >> e;
    nums[p] = -e;
    p_k = p;
  }
  const OsaK osa_k(p_k);
  for (int r = 1; r <= p_k - r; ++r) {
    for (const auto& [p, e] : osa_k.query(p_k - r + 1)) {
      if (nums[p] == 0) ++nonzero;
      if ((nums[p] += e) == 0) --nonzero;
    }
    for (const auto& [p, e] : osa_k.query(r)) {
      if (nums[p] == 0) ++nonzero;
      if ((nums[p] -= e) == 0) --nonzero;
    }
    if (nonzero == 0) {
      cout << p_k << ' ' << r << '\n';
      return 0;
    }
  }
  cout << "-1 -1\n";
  return 0;
}