#include<cstdio>
const int nmax=16000;
int ve[nmax+5];
int main()
{
    freopen("transport.in","r",stdin);
    freopen("transport.out","w",stdout);
    int i,n,k,st,dr,mi,la,nt,cur;
    scanf("%d%d",&n,&k);
    st=1;
    dr=nmax*nmax;
    for(i=1;i<=n;i++)
    {
        scanf("%d",&ve[i]);
        if(ve[i]>st)
            st=ve[i];
    }
    while(st<=dr)
    {
        mi=(st+dr)/2;
        cur=0;
        nt=1;
        for(i=1;i<=n;i++)
        {
            if(cur+ve[i]>mi)
            {
                cur=ve[i];
                nt++;
            }
            else
                cur=cur+ve[i];
        }
        if(nt<=k)
        {
            la=mi;
            dr=mi-1;
        }
        else
        {
            st=mi+1;
        }


    }
    printf("%d\n",la);
    return 0;
}