#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i=0;i<n;i++)

signed main(){
  int n,d;
  cin>>n>>d;
  vector<int>dist(n-1);
  vector<int>pos(n,0);
  rep(i,n-1) cin>>dist[i];
  rep(i,n-1) {
    pos[i+1]=pos[i]+dist[i];
    //cout<<i+1<<" "<<pos[i+1]<<endl;
  }
  cout<<0;
  int temp=0;
  rep(i,n-1){
    cout<<" ";
    if(temp+d<=pos[i+1]){
      temp=pos[i+1];
      cout<<pos[i+1];
      continue;
    }
    else{
      temp+=d;
      cout<<temp;
    }
  }
  cout<<endl;
  return 0;
}