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#include <cstdio>
int way[1005],dif,n;
long long ile = 0;
void usyp(){
    for(int i=0; i<n-1; i++){
        if( way[i] < way[i+1]){
            if ( way[i+1] - way[i] > dif ){
                ile += (way[i+1] - dif) - way[i];
                way[i] = way[i+1] - dif;
            }
        } else {
            if ( way[i] - way[i+1] > dif ){
                ile += (way[i] - dif) - way[i+1];
                way[i+1] = way[i] - dif;
            }
        }
    }
    return;
}
void show(){
    for(int i=0; i<n; i++)
        printf("%d ",way[i]);
    printf("\n");
    return;
}
int main(){
    scanf(" %d %d",&n,&dif);
    for(int i=0; i<n; i++)
        scanf(" %d",&way[i]);
    for(int i=0;i<10000; i++)
        usyp();
    //show();
    printf("%lld\n",ile);
    return 0;
}