#include <cstdio>
using namespace std;
int s[16016];
int s2[16016];

int main()
{
    freopen("transport.in","r",stdin);
    freopen("transport.out","w",stdout);
    int n,k,i,st,ans,dr,maxi=0,r,rasp,x;
    scanf("%d%d",&n,&k);
    for(i=1;i<=n;++i){
      scanf("%d",&x);
      if(x>maxi) maxi=x;
      s[i]=s[i-1]+x;
      s2[i]=s[i];
    }
    int fin=s[n];
    int ok=0;
    for(r=maxi;r<=fin && ok==0;++r){
      int mis=0,poz=1;
      for(i=1;i<=n;++i) s2[i]=s[i];
      while(poz<=n){
      st=poz;
      dr=n;
      ans=-1;
      while(st<=dr){
         int mij=(st+dr)/2;
         if(s2[mij]<=r){
            st=mij+1;
            ans=mij;
         }
         else
            dr=mij-1;
      }
      ++mis;
      for(i=ans+1;i<=n;++i) s2[i]=s2[i]-s2[ans];
      poz=ans+1;
      }
      if(mis<=k) {ok=1;rasp=r;}
    }
    printf("%d\n",rasp);
    return 0;
}