#include<bits/stdc++.h>
using namespace std;
int n,m;
unsigned long long int fz[105],fm[105],z[55],resfz=0,resfm=1;
int gcd(int a,int b){
     return !b?a:gcd(b,a%b);
}
int main(){
	freopen("fenshu.in","r",stdin);
	freopen("fenshu.out","w",stdout);
	cin>>n>>m;
	for(int i=0;i<n;++i){
		cin>>fz[i]>>fm[i];
	}
	for(int i=0;i<m;++i){
		cin>>z[i];
	}
	for(int i=0;i<n;++i){
		resfm = resfm*fm[i];
		resfz = resfz*fm[i]+fz[i]*resfm;
		//resfm /= gcd(resfm,resfz);
		//resfz /= gcd(resfm,resfz);
	}
	for(int i=0;i<m;++i){
		resfz += z[i]*resfm;
		//resfz /= gcd(resfm,resfz);
	}
	cout<<resfz/gcd(resfm,resfz)<<' '<<resfm/gcd(resfm,resfz);
	return 0;
}