#include <bits/stdc++.h>
using namespace std;
#define ull unsigned long long
int n,m;
ull gcd(int a,int b){
	if(a%b==0) return b;
	return gcd(b,a%b);
}
ull up=-1,down=-1;
void huajian(){
	if(up==down){
		up=1;
		down=1;
	}else if(up<down){
		ull tmp=up;
		up=up/gcd(down,up);
		down=down/gcd(down,tmp);
	}else{
		ull tmp=up;
		up=up/gcd(tmp,down);
		down=down/gcd(tmp,down);
	}
}
int main(){
	freopen("fenshu.in","r",stdin);
	freopen("fenshu.out","w",stdout);
	cin>>n>>m;
	for(int i=1;i<=n;i++){
		ull a,b;
		cin>>a>>b;
		if(up==-1&&down==-1){
			up=a,down=b;
		}else{
			up=up*b+down*a;
			down=down*b;	
		}
		huajian();
	}
	for(int i=1;i<=m;i++){
		ull a;
		cin>>a;
		down*=a;
		huajian();
	}
	if(down==1){
		cout<<up;
	}else{
		cout<<up<<" "<<down;
	}
	fclose(stdin);
	fclose(stdout);
	return 0;
}