#include<iostream>
#include<cstdio>
using namespace std;
typedef unsigned long long ull;
ull n,m,x,y,k,fz,fm;
ull gcd(ull a,ull b){
	if(a==0){return b;}
	return gcd(b%a,a);
}
int main(){
	freopen("fenshu.in","r",stdin);
	freopen("fenshu.out","w",stdout);
	cin>>m>>n;
	fm=1;
	for(int i=1;i<=m;i++){
		cin>>x>>y;
		fz=fm*x+fz*y;
		fm=fm*y;
		int g=gcd(fz,fm);
		fz/=g;
		fm/=g;
	}
	for(int i=1;i<=n;i++){
		cin>>k;
		fm*=k;
		int g=gcd(fz,fm);
		fz/=g;
		fm/=g;
	}
	if(fz%fm==0){cout<<fz/fm;}
	else{cout<<fz<<" "<<fm;}
	return 0;
}