#include <cstdio>

using namespace std;
int v[16005];
int n,k;
int trans(int med)
{
    int s=0,kp=0,i;
    for(i=1;i<=n;++i)
    {
        if(med<v[i])
            return k+1;
        if(med>=s+v[i])
            s=s+v[i];
        else
        {
            kp++;
            s=v[i];
        }
    }
    return kp;
}
int main()
{
    freopen("transport.in","r",stdin);
    freopen("transport.out","w",stdout);
    int i,smax=0;
    scanf("%d%d",&n,&k);
    for(i=1;i<=n;++i)
    {
        scanf("%d",&v[i]);
        smax+=v[i];
    }
    int st,dr,med,last,mtrans;
    st=1;
    dr=smax;
    last=dr+1;
    while(st<=dr)
    {
        med=(st+dr)>>1;
        mtrans=trans(med);
        if(mtrans<=k)
        {
            dr=med-1;
            if(last>med)
                last=med;
        }
        else
            st=med+1;
    }
    printf("%d\n",last+1);
    return 0;
}