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#include <iostream>
using namespace std;

int n, k, a[1003], res;
bool changed = true;

int main(){
    ios::sync_with_stdio(false);
    cin.tie(NULL);

    cin>>n>>k;

    for(int i = 1 ; i <= n; i++){
        cin >> a[i];
    }


    while(changed){
        changed = false;
        for(int i = 1; i <= n; i++){
            if (a[i+1] - a[i] > k){
                res+=a[i+1] - (a[i] + k);
                a[i] = a[i+1] - k;
                changed = true;
            }
            if (a[i-1] - a[i] > k){
                res+=a[i-1] - (a[i] + k);
                a[i] = a[i-1] - k;
                changed = true;
            }
        }
    }
    cout<<res<<endl;
}