#include<bits/stdc++.h>
using namespace std;
typedef __int128 l;
l n,m,fz=0,fm=1;
l gcd(l a,l b)
{
	if(a%b==0)
		return b;
	else
		return gcd(b,a%b);
}
l lcm(l a,l b)
{
	return a/gcd(a,b)*b;
}
void add(l z,l m)
{
	l g=lcm(fm,m);
	l zz=g/fm*fz+g/m*z;
	l c=gcd(zz,g);
	fz=zz/c;fm=g/c;
	return;
}
inline l read()
{
    l x=0,f=1;
    char ch=getchar();
    while(ch<'0'||ch>'9')
	{
        if(ch=='-')
            f=-1;
        ch=getchar();
    }
    while(ch>='0'&&ch<='9')
	{
        x=(x<<1)+(x<<3)+(ch^48);
        ch=getchar();
    }
    return x*f;
}
inline void write(l a)
{
    if(a<0)
	{
        putchar('-');
        a=-a;
    }
    if(a>9)write(a/10);
    putchar(a%10+'0');
}
int main(){
	freopen("fenshu.in","r",stdin);
	freopen("fenshu.out","w",stdout);
	n=read();m=read();
	for(int i=1;i<=n;i++)
	{
		l a,b;
		a=read();b=read();
		add(a,b);
	}
	for(int i=1;i<=m;i++)
	{
		l a,b;
		a=read();
		b=gcd(a,fz);
		fz/=b;
		fm*=(a/b);
	}
	if(fz%fm==0)
	{
		write(fz/fm);
		puts("");
	}
	else
	{
		write(fz);
		putchar(' ');
		write(fm);
		puts("");
	}
	return 0;
}