#include #include #define rep2(i,k,n) for(i64 i=(i64)(k);i<(i64)(n);i++) #define rep(i,n) rep2(i,0,n) #define all(x) begin(x),end(x) #ifdef ENV_LOCAL #define dump if (1) cerr #else #define dump if (0) cerr #endif using namespace std; using namespace std::string_literals; using i32 = int32_t; using i64 = int64_t; using f64 = double; using f80 = long double; using vi32 = vector; using vi64 = vector; //using namespace harudake; int main() { ios::sync_with_stdio(false); cin.tie(nullptr); i64 n,m,p; cin>>n>>m>>p; vi64 a(n); rep(i,n)cin>>a[i]; i64 mx = *max_element(all(a)); if (mx >= m) { cout << 1 << endl; return 0; } vi64 ra = a; vi32 ip(n, 1); rep(i,n) { while (ra[i] % p == 0) { ra[i] /= p; ++ip[i]; } } vi64 dp(931, 0); dp[0] = 1; rep(i,n) { rep(j,901) { dp[j+ip[i]] = max(dp[j+ip[i]], min(m, dp[j] * ra[i])); } } rep(i,900) { if (dp[i] * mx > m) { cout << i+1 << endl; return 0; } } cout<<-1<