#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,j=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];
    }
    if (n<50)
        for (i=start; i<stop+1; ++i)
        {
            x=i;
            t=1;
            for (j=0; j<n; ++j)
                if (x>=v[j])
                    x-=v[j];
                else
                {
                    ++t;
                    x=i-v[j];
                }
            if (t<=k)
            {
                rez=i;
                i=stop+2;
            }
        }
    else
    {
        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;
}