#include <cstdio>
using namespace std;
int n, li, ls, m, s, sol, a[16010], i, Max, nr, k;
int main()
{
    freopen("transport.in","r",stdin);
    freopen("transport.out","w",stdout);
    scanf("%d %d\n",&n,&k);
    for(i=1;i<=n;i++)
    {
        scanf("%d ",&a[i]);
        if(a[i]>Max) Max=a[i];
        s+=a[i];
    }
    li=Max;
    ls=s;
    m=(li+ls)/2;
    while(li<=ls)
    {
        s=0;
        nr=0;
        for(i=1;i<=n;i++)
        {
            s+=a[i];
            if(s>m&&i!=n) nr++, s=a[i];
                else if(i==n) nr++;
        }
        if(s-m>0) nr++;
        if(nr<=k)
        {
            sol=m;
            ls=m-1;
        }
        else li=m+1;
        m=(li+ls)/2;
    }
    printf("%d\n",sol);
    return 0;
}