#include <bits/stdc++.h>
using namespace std;
typedef __int128 ll;
int n,m;
ll az=0,am=1;
ll gcd(ll a,ll b){
    if (b==0)return a;
    return gcd(b,a%b);
}
ll lcm(ll a,ll b){
    return a/gcd(a,b)*b;
}
void addsum(ll bz,ll bm){
    ll t=lcm(am,bm);
    ll tz=t/am*az+t/bm*bz;
    ll l=gcd(tz,t);
    az=tz/l;am=t/l;
    return ;
}
ll read(){
    ll t=0;
    char s[50];
    scanf("%s",s);
    for (int i=0;i<strlen(s);i++){
        t*=10;
        t+=s[i]-'0';
    }
    return t;
}
void write(ll x){
    if(x>9)write(x/10);
    putchar(x%10+'0');
    return ;
}
int main(){
    freopen ("fenshu.in","r",stdin);
    freopen ("fenshu.out","w",stdout);
    cin>>n>>m;
    for (int i=1;i<=n;i++){
        ll a,b;
        a=read();b=read();
        addsum(a,b);
    }
    for (int i=1;i<=m;i++){
        ll a,b;
        a=read();
        b=gcd(a,az);
        az/=b;
        am=a/b*am;
    }
    if (az%am==0){
        write(az/am);
    }
    else{
        write(az);
        printf(" ");
        write(am);
    }
    return 0;
    return 0;
}