#include<bits/stdc++.h>
using namespace std;
const long long inf = (long long) 1e18 + 10;
const int inf1 = (int) 1e9 + 10;
#define int long long
#define dbl long double
#define endl '\n'
#define sc second
#define fr first
#define mp make_pair
#define pb push_back
#define all(x) x.begin(), x.end()
#define maxn 110000
#define mxv 10000000
int m, q, p[maxn];
void solve() {
cin >> m >> q;
for(int i = 1; i <= m; i++) {
cin >> p[i];
}
int x; cin >> x;
int ans = 0;
while(x != 0) {
int mn = x;
for(int i = 1; i <= m; i++) {
mn = min(mn, x - x%p[i]);
}
if(mn == x) {
cout << "oo" << endl;
return;
}
x = mn;
ans++;
}
cout << ans << endl;
}
int32_t main() {
ios::sync_with_stdio(false); cin.tie(0);
// freopen("in.in", "r", stdin);
//freopen("out.out", "w", stdout);
int tt = 1;
// cin >> tt;
while(tt--) solve();
}
