#include<bits/stdc++.h>
#define ull unsigned long long
using namespace std;

int n, m;
ull p = 0, q = 1;

ull gcd(ull a, ull b) {
	if(!b) return a;
	return gcd(b, a % b);
}

void yuefen(ull &a, ull &b) {
	ull d = gcd(a, b);
	a /= d;
	b /= d;
}

int main() {
	freopen("fenshu.in", "r", stdin);
	freopen("fenshu.out", "w", stdout);
	cin>>n>>m;
	for(int i = 0; i < n; i++) {
		ull a, b, oq = q, op = p;
		cin>>a>>b;
		p = b * op + a * oq;
		q = b * oq;
		yuefen(p, q);
	}
	for(int i = 0; i < m; i++) {
		ull x;
		cin >> x;
		yuefen(p, x);
		q *= x;
	}
	yuefen(p, q);
	cout<<p;
	if(q != 1) cout<<" "<<q;
	return 0;
}