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

int p,q;
int n,m;
int ans_z,ans_m;
int gcd(int a,int b) { 
	if(a<b){
		swap(a,b);
	}
	if(a%b==0) return b;
	else return gcd(b,a%b);
}

int gcd1(int a,int b){
	return a*b/gcd(a,b);
}

signed main(){
	freopen("fenshu.in","r",stdin);
	freopen("fenshu.out","w",stdout);
	cin >> n >> m;
	cin >> p >> q;
	ans_z=p;
	ans_m=q;
	for(int i=2;i<=n;i++){
		cin >> p >> q;
		int k=gcd1(ans_m,q);
		int k1=k/ans_m;
		int k2=k/q;
		ans_m=k;
		ans_z=k1*ans_z+k2*p;
		
		int v=gcd(ans_m,ans_z);
		ans_m/=v;
		ans_z/=v;
	}
	for(int i=1;i<=m;i++){
		cin >> p;
		if(ans_z%p==0){
			ans_z=ans_z/p;
			continue;
		}
		ans_m*=p;
	}
	int v=gcd(ans_m,ans_z);
	ans_m/=v;
	ans_z/=v;
	if(ans_m==1){
		cout << ans_z;
		return 0;
	}
	cout << ans_z << " " << ans_m;
	
	return 0;
}