#include<cstdio>
#include<algorithm>
#include<cstring>
#define Nmax 16005
using namespace std;
int n,i,j,k,st,dr,mij,m,s,sol;
int v[Nmax];
int main()
{
    freopen("transport.in","r",stdin);
    freopen("transport.out","w",stdout);
    scanf("%d %d",&n,&k);
    st=1;
    for (i=1;i<=n;i++)
    scanf("%d",&v[i]),dr+=v[i],st=max(v[i],st);
    sol=dr;
    while (st<=dr)
    {
        mij=(st+dr)/2;
        m=0; s=0;
        for (i=1;i<=n;i++)
        {
            if (s+v[i]<=mij) s+=v[i];
            else
            {
                m++;
                s=v[i];
            }
        }
        if (s) m++;
        if (m<=k) dr=mij-1,sol=min(sol,mij);
        else st=mij+1;
    }
    printf("%d",sol);
    return 0;
}