#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()
const int maxn = -1;
int n, m, d;
void solve() {
cin >> n >> m >> d;
int mx = -inf;
int ans = 0;
for(int i = 1; i <= m; i++) {
int x; cin >> x;
mx = max(mx, x - i*d);
ans = max(ans, -(x - i*d) + mx);
// cout << mx << " " << ans << endl;
if(ans%2 == 0) {
cout << ans/2 << endl;
}
else {
cout << ans/2 << ".5" << 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();
}
}
