#include <bits/stdc++.h>
#define int int64_t
void solve() {
int n, d;
std::cin >> n >> d;
std::vector<int> a(n);
for(int i = 0; i < n; i++) {
std::cin >> a[i];
}
int ans = n;
for(int mask = 0; mask < (1LL << n); mask++) {
int can = 1;
std::vector<int> b = a;
for(int i = 1; i < n; i++) {
if(mask & (1LL << i)) {
b[i] = (i == 0 ? d : b[i - 1] + d);
}
}
int c = 0;
for(int i = 0; i < n; i++) {
can &= (b[i] - c <= d);
c = b[i];
}
if(can) {
ans = std::min(ans, (int64_t)__builtin_popcount(mask));
}
}
std::cout << ans;
}
signed main() {
std::ios::sync_with_stdio(false);
std::cin.tie(nullptr);
int t = 1;
//std::cin >> t;
while (t--) {
solve();
}
return 0;
}
