#include <iostream>
#include <cstdio>
#define ull unsigned long long
using namespace std;
ull n,m,sx,sy,x,y;
ull gcd(ull a,ull b){
	if(b==0) return a;
	if(a<b) return gcd(b,a);
	return gcd(b,a%b); 
}
ull lcm(ull a,ull b){ return a/gcd(a,b)*b; }
int main(){
	freopen("fenshu.in","r",stdin);
	freopen("fenshu.out","w",stdout);
	cin >>n>>m>>x>>y;
	sx=x/gcd(x,y),sy=y/gcd(x,y);
	for(int i=2;i<=n;i++){
		cin >>x>>y;
		ull q=sx,p=sy;
		sy=p*y;
		sx=q*y+p*x;
		ull chu=gcd(sx,sy);
		sy=sy/chu,sx=sx/chu;
		//cout<<sx<<" "<<sy<<endl;
	}
	for(int i=1;i<=m;i++){
		cin >>x;
		sy=sy*x;
		ull chu=gcd(sx,sy);
		sx=sx/chu,sy=sy/chu;
	}
	if(sy!=1) cout <<sx<<" "<<sy;
	else cout <<sx;
	return 0;
}