#include<bits/stdc++.h>
using namespace std;
int n,m;
long long a,b,u;
long long ansz;
long long ansm;
int main(){
	freopen("fenshu.in","r",stdin);
	freopen("fenshu.out","w",stdout);
	cin>>n>>m;
	for(int i=1;i<=n;i++){
		cin>>a>>b;
	if(i==1){
		ansz=a;
		ansm=b;
	}
	else{
		int t=ansm;
		ansm=ansm*b;
		ansz=t*a+ansz*b;
	}
	}
	for(int i=1;i<=m;i++){
		cin>>u;
		ansm=ansm*u;
	}
	long long o=__gcd(ansz,ansm);
	ansz/=o;
	ansm/=o;
	if(ansm==1){
		cout<<ansz;
	}
	else cout<<ansz<<" "<<ansm;
	return 0;
}