#include<cstdio>
using namespace std;
int i,n,k,s=0,v[2001],y,inc,sf,med,ans;
int verif(int capacitate)
{
    int j,x=0,ct=1;
    for(j=1;j<=n;j++)
    {
        if(v[j]>capacitate)
            return 0;
        if(x+v[j]<=capacitate)
            x+=v[j];
        else
        {
            ct++;
            x=v[j];
        }
    }
    if(ct<=k)
        return 1;
    return 0;
}
FILE *in,*out;
int main ()
{
    in=fopen("transport.in","r");
    out=fopen("transport.out","w");
    fscanf(in,"%d %d",&n,&k);
    for(i=1;i<=n;i++)
    {
        fscanf(in,"%d ",&v[i]);
        s+=v[i];
    }
    inc=1;
    sf=s;
    while(inc<=sf)
    {
        med=(inc+sf)/2;
        y=verif(med);
        if(y==0)
            inc=med+1;
        else
        {
            sf=med-1;
            ans = med;
        }
    }
    fprintf(out,"%d",ans);
    return 0;
}