#include <bits/stdc++.h>
using namespace std;

#define rep(i, a, b) for (int i = a; i < b; i++)
using ll = long long;

int main(){
	int n, m, t;
	cin >> n >> m >> t;
	vector<int> a(m);
	rep(i, 0, m) cin >> a[i];
	sort(a.begin(), a.end());
	ll ans = ll(m) * t, s = 0;
	rep(i, 0, m) {
		ll r = m - (i + 1);
		if(r < 0 || a[i] != 1) break;
		s++;
		ans = min(ans, max(s, r * t));
	}
	cout << ans << endl;
}