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#include <iostream>
using namespace std;

int main() {
int n, k;
int suma=0;
int a;
cin>> n >> k;
cin >> a;
for (int i=0; i<n-1; i++){
	int b;
	cin >> b;
	if(a-b>k){
		suma= suma + ((a-b)-k);
		b = b + ((a-b)-k);
	}
	a=b;
}
cout << suma;



    return 0;
}