#include <bits/stdc++.h>
#include <fstream>
#define endl '\n'
#define mod 998244353
#define INF 900000000000000000
//#define cin fin
//#define cout fout
#define fi first
#define se second
using namespace std;
//ofstream fout("intel.out");
//ifstream fin("intel.in");
const int Max = 5e3 + 1;
long long dp[Max][Max];
int main()
{
ios_base::sync_with_stdio(0);cout.tie(0);cin.tie(0);
int n, m; cin >> n >> m; long long arr[n+1];
for(int i = 1; i <= n; i++) {
cin >> arr[i];
}
for(int i = 0; i < Max; i++) {
for(int j = 0; j < Max; j++) {
dp[i][j] = INF;
}
}
dp[0][0] = 0;
for(int i = 1; i <= n; i++) {
for(int j = 0; j < Max; j++) {
if(j == arr[i]) {
dp[i][j] = min(dp[i-1][max(0,j-m)],dp[i][j]);
}
else {
dp[i][j] = min(dp[i-1][max(0,j-m)]+1,dp[i][j]);
}
}
for(int j = Max-2; j >= 0; j--) {
dp[i][j] = min(dp[i][j+1],dp[i][j]);
}
}
long long ans = INF;
for(int i = 0; i < Max; i++) {
ans = min(ans,dp[n][i]);
}
cout << ans;
return 0;
}
