#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
const int N=104;
const int K=1e6;
ll n,lng;
double x,sum,p[N];
string inp;
int main(){
	ios::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
	cin>>n;
	for(int i=1;i<n;i++){
		cin>>p[i];
		sum+=p[i];
	}
	cin>>inp;
	p[n]=1-sum;
	lng=inp.size()-2;
	x=pow(10,-lng)/2;
	for(int i=1;i<K;i++){
		ll cnt=0;
		for(int j=1;j<=n;j++){
			ll t=(ll)(p[j]*i+(double)0.4999999);
			if(p[j]-x<=(double)t/i&&(double)t/i<p[j]+x){
				cnt+=t;
			}else{
				cnt=-1;
				break;
			}
		}
		if(cnt==i){
			cout<<cnt;
			exit(0);
		}
	}
	cout<<"1000000";
}