#include <bits/stdc++.h>
using namespace std;
const int N=5e3+12;
int a[N];
int n,m;
int recur(int i,int val=0)
{
if(i>n)
{
return 0;
}
int mi=n;
if((a[i]-val)<=m)
mi=min(mi,recur(i+1,a[i]));
else
mi=min(mi,1+recur(i+1,val+m));
return mi;
}
void solve()
{
// statement read incorrectly
cin>>n>>m;
a[0]=0;
for(int i=1;i<=n;i++)
cin>>a[i];
cout<<recur(1,0)<<endl;
}
int main()
{
ios::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
int t=1;
// cin>>t;
while(t--)solve();
return 0;
}
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