#include<cstdio>
using namespace std;
int main()
{
    freopen("transport.in","r",stdin);
    freopen("transport.out","w",stdout);
    int st,q,dr,s=0,ma=0,n,k,mid,ind,ct,v[16007];
    scanf("%d %d",&n,&k);
    for(int i=1; i<=n; i++)
    {
        scanf("%d",&v[i]);
        if(v[i]>ma) ma=v[i];
        s+=v[i];
    }
    st=ma;
    dr=s;
    while(st<=dr)
    {
        mid=(st+dr)/2;
        ind=0;
        q=mid;
        for(int i=1; i<=n; i++)
            if(v[i]<=q) q-=v[i];
            else
            {
                q=mid-v[i];
                ind++;
            }
        ind++;
        if(ind<=k) dr=mid-1;
        else st=mid+1;
    }
    printf("%d",st);
    return 0;
}