偶数求和

#include<iostream>
#include<cmath>
#include<cstdio>
#include<iomanip>
#define eps   0.0000001
using namespace std;
int main()
{
  int n,m;
  while(cin>>n>>m)
  {
      int sum=0,j=1;bool r=true;
      int i=2;int k=0;
      for(;j<=n;++j,i+=2)
      {
          k+=i;sum++;
          if(sum==m) {
        if(r==1) cout<<k/sum;else  cout<<" "<<k/sum;r=false;k=0;sum=0;
          }
      }
      if(sum!=0)cout<<" "<<k/sum<<endl;
      else cout<<endl;

  }
}