#include<bits/stdc++.h>
using namespace std;
#define int long long
#define ii pair <int, int>
#define app push_back
#define all(a) a.begin(), a.end()
#define bp __builtin_popcountll
#define ll long long
#define mp make_pair
#define x first
#define y second
#define Time (double)clock()/CLOCKS_PER_SEC
#define debug(x) std::cout << #x << ": " << x << '\n';
#define FOR(i, n) for (int i = 0; i < n; ++i)
#define pb push_back
#define trav(a, x) for (auto& a : x)
using vi = vector<int>;
template <typename T>
std::ostream& operator <<(std::ostream& output, const pair <T, T> & data)
{
    output << "(" << data.x << "," << data.y << ")";
    return output;
}
template <typename T>
std::ostream& operator <<(std::ostream& output, const std::vector<T>& data)
{
    for (const T& x : data)
        output << x << " ";
    return output;
}
//ll div_up(ll a, ll b) { return a/b+((a^b)>0&&a%b); } // divide a by b rounded up
//ll div_down(ll a, ll b) { return a/b-((a^b)<0&&a%b); } // divide a by b rounded down 
#define tcT template<class T
#define tcTU tcT, class U
tcT> using V = vector<T>; 
tcT> void re(V<T>& x) { 
    trav(a, x)
        cin >> a;
}
tcT> bool ckmin(T& a, const T& b) {
    return b < a ? a = b, 1 : 0; 
} // set a = min(a,b)
tcT> bool ckmax(T& a, const T& b) {
    return a < b ? a = b, 1 : 0; 
}

const int INF = 1e9+7, C = 1007;
int dp[C];

signed main() {
    #ifdef HOME
    freopen("input.txt", "r", stdin);
    #else
    #define endl '\n'
    ios_base::sync_with_stdio(0); cin.tie(0);
    #endif
    int n, m, p;
    cin >> n >> m >> p;
    vi a(n);
    re(a);

    FOR (i, C)
        dp[i] = 1;            

    trav(x, a) {
        int cost = 1;
        int t = x;
        while (t % p == 0) {
            t /= p;
            cost++;
        }   
        ckmax(dp[cost], t);
    }   
    
    FOR (i, C)
        FOR (j, i)
            ckmax(dp[i], min(dp[j] * dp[i - j], INF));

    int ans = INF;
    trav (last, a) {
        int w = m/last + 1;
        int p = lower_bound(dp, dp + C, w) - dp;
        if (p != C)                                     
            ckmin(ans, p + 1);
    }
    if (ans == INF)
        cout << -1 << endl;
    else
        cout << ans << endl;
}