#include <bits/stdc++.h>   using namespace std;   signed main() {     long long int n, i, m, k, x, pc = 0, c = 0;     cin >> n >> m >> k;     long long int p, f;     queue<long long int> q;     for (i = 0; i < m; i++) {       cin >> x;       q.push(x - 1);     }     x = 0;     while (!q.empty()) {       f = q.front();       p = (f - c) / k;       while (!q.empty() && ((q.front() - c) / k) == p) {         pc++;         q.pop();       }       c = pc;       x++;     }     cout << x;   }   