#include <bits/stdc++.h>
#define FastIO ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0)
#define ll long long
#define PB push_back
#define ALL(v) (v).begin(), (v).end()
#define FOR(i, a, b) for (int i = (a), _b = (b); i <= _b; i++)
#define FORD(i, b, a) for (int i = (b), _a = (a); i >= _a; i--)
#define fi first
#define se second
#define BIT(x, i) (((x) >> (i)) & 1)
using namespace std;
/** END OF TEMPLATE **/
const int mxN = 2e5 + 5;
int n, m;
int a[mxN];
int L[mxN];
int main()
{
FastIO;
//freopen("test.inp", "r", stdin);
//freopen("test.out", "w", stdout);
cin >> n >> m;
FOR(i, 1, n) {
cin >> a[i];
a[i] = i*m - a[i];
}
int len = 0;
FOR(i, 1, n) {
if(a[i] < 0) continue;
int id = upper_bound(L+1, L+len+1, a[i]) - L;
L[id] = a[i];
len = max(len, id);
}
cout << n - len;
return 0;
}
/*
*/
