#include <stdio.h>

int v[16001];

int main()
{
    int n=0,i=0,start=0,mid=0,stop=0,t=1,k=0,x=0,rez=0;
    freopen("transport.in","r",stdin);
    freopen("transport.out","w",stdout);
    scanf("%d%d",&n,&k);
    for (i=0; i<n; ++i)
    {
        scanf("%d",&v[i]);
        stop+=v[i];
        if (v[i]>start)
            start=v[i];
    }
    while(stop>start)
    {
        mid=(stop+start)/2;
        x=mid;
        for (i=0; i<n; ++i)
            if (x>=v[i])
                x-=v[i];
            else
            {
                ++t;
                x=mid-v[i];
            }
        if(t>k)
            start=mid+1;
        else
        {
            stop=mid-1;
            rez=mid;
        }
        t=1;
    }
    --rez;
    x=rez;
    for (i=0; i<n; ++i)
    {
        if (x>=v[i])
            x-=v[i];
        else
        {
            ++t;
            x=rez-v[i];
        }
    }
    if (t>k)
        ++rez;
    printf("%d",rez);
    return 0;
}