#include<cstdio>
#include<iostream>
#include<algorithm>
using namespace std;
int n,m;
long long x,y,g;
long long az,am;
void fj(long long a,long long b){
	if(am==b)az+=a;
	else if(am==0)am=b,az=az*b+a*b;
	else if(az==0)am=am*b,az=a*b;
	else am=am*b,az=az*b+a*b;
}
void zc(long long a){
	if(am==0)am=a;
	else am*=a;
}
int main(){
	freopen("fenshu.in","r",stdin);
	freopen("fenshu.out","w",stdout);
	cin>>n>>m;
	for(int i=1;i<=n;i++)cin>>x>>y,fj(x,y);
	for(int i=1;i<=m;i++)cin>>x,zc(x);
	g=__gcd(az,am);
	if(am>az)cout<<az/g<<' '<<am/g<<endl;
	else if(az>am&&az%am!=0)cout<<az/g<<' '<<am/g<<endl;
	if(az>=am&&az%am==0)cout<<az/am<<endl;
	return 0;
}