#include<cstdio>
using namespace std;
int n,k,v[16005],li=1,ls,s,nr,mij;
int main()
{
    int i;
    freopen("transport.in","r",stdin);
    freopen("transport.out","w",stdout);
    scanf("%d%d",&n,&k);
    for (i=1;i<=n;++i)
            {
                scanf("%d",&v[i]);
                if (v[i]>ls) ls=v[i];
            }
   while(li<ls)
    {
        s=0;
        nr=1;
        mij=(li+ls)/2;
        for (int i=1;i<=n;++i)
            if (s+v[i]<=mij)
                s+=v[i];
            else
            {
                s=v[i];
                ++nr;
            }
        if (nr>k)
            li=mij+1;
        else
            ls=mij;
    }
    printf("%d\n",li+1);
    return 0;
}