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#include <vector>
#include <algorithm>
#include <iostream>

using namespace std;

int main() {
    int n,k,ans = 0,a;
    cin>>n>>k;
    vector<int> v;
    for(int i=0; i<n; ++i) {
        cin>>a;
        v.push_back(a);
    }
    for(int i=0; i<n; ++i) {
        int m = 0;
        for(int j=0; j<n; ++j) {
            m = max(v[j] - v[i] - k*(abs(j-i)),m);
        }
        ans += m;
    }
    
    cout<<ans<<endl;
    
    return 0;
}