#include<bits/stdc++.h>
using namespace std;

int main(){
	int k;
	cin >> k;
	vector<int>e(10000000+1);
	int p;
	for(int i=0;i<k;i++){
		int pp,ee;
		cin >> pp >> ee;
		p=pp;
		e[pp]=ee;
	}

	vector<int>mpf(p+1);
	for(int i=2;i<=p;i++)if(!mpf[i])for(int j=i;j<=p;j+=i)mpf[j]=i;

	int diff=k;
	for(int r=1;r<=p/2;r++){
		for(int temp=p-r+1;temp!=1;temp/=mpf[temp]){
			if(!e[mpf[temp]])diff++;
			e[mpf[temp]]--;
			if(!e[mpf[temp]])diff--;
		}
		for(int temp=r;temp!=1;temp/=mpf[temp]){
			if(!e[mpf[temp]])diff++;
			e[mpf[temp]]++;
			if(!e[mpf[temp]])diff--;
		}
		if(!diff){
			cout << p << ' ' << p-r << endl;
			return 0;
		}
	}
	cout << "-1 -1" << endl;
}