#include<bits/stdc++.h> 
using namespace std;
unsigned long long pd = 0;
unsigned long long fenmu,fenzi;
unsigned long long zheng;
unsigned long long ans = 0,ans2 = 0;
unsigned long long gcd(unsigned long long a,unsigned long long b)
{
    if(a<b)swap(a,b);
    if(a%b==0)return b;
    else gcd(b,a%b);
}
unsigned long long lcm(unsigned long long a, unsigned long long b)
{
	return a*b/gcd(a,b);
} 
inline int read()
{
   register int s=0,w=1;
   register char ch=getchar();
   while(ch<'0'||ch>'9')
   {
        if(ch=='-')
        {
            w=-1;
            ch=getchar();   
        }
   }
   while(ch>='0'&&ch<='9') 
   {
        s=s*10+ch-'0';
        ch=getchar();
   }
   return s*w;
}
int main(void)
{
	freopen("fenshu.in","r",stdin);
	freopen("fenshu.out","w",stdout);
	int n,m;
	n = read(); m = read();
	for(int i = 0; i < n; ++i)
	{
		fenzi = read(); fenmu = read();
		if(ans == 0 || ans2 == 0)
		{
			ans = fenzi; ans2 = fenmu;
			continue;
		}
		unsigned long long c = lcm(ans2,fenmu);
		ans = ans*(c/ans2) + fenzi*(c/fenmu);
		ans2 = c;
		unsigned long long d = gcd(ans, ans2);
		ans /= d; ans2 /= d;
		//printf("jieguo:%lld %lld\n", ans, ans2);
	}
	for(int i = 0; i < m; ++i)
	{
		zheng = read();
		ans2 *= zheng;
		//printf("jieguo2:%lld %lld\n", ans, ans2);
	}
	unsigned long long d = gcd(ans, ans2);
	if(ans % ans2 == 0) printf("%lld", ans/ans2);
	else printf("%lld %lld", ans/d, ans2/d);
	return 0;
}