#include<bits/stdc++.h>
using namespace std;
#define int long long
#define fi first
#define se second
int const N=5e5+10;
int a[N];
int sum[N];
int ma=-1000000000;
int res=0;
signed main()
{
    cin.tie(0)->sync_with_stdio(false);
    int n,k;
    cin>>n>>k;
    for(int i=1;i<=n;i++){
        cin>>a[i];
    }
    a[0]=0;
    for(int i=0;i<=n;i++){
        if(abs(a[i+1]-a[i])>k){
           if(a[i+1]>a[i]){
                a[i+1]=a[i]+k;
           }
           else a[i+1]=a[i]-k;
        }
    }
    cout<<res;
}
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