#include <cstdio>
using namespace std;
int v[3002];
int n, k;
bool incerc(int c)
{
    int i, s=0, nr=0;
    for(i=1; i<=n; ++i)
    {
        if (v[i]>c)
            return 0;
        if (s+v[i]>c)
        {
            ++nr;
            s=v[i];
        }
        else
            s+=v[i];
        if (nr>k)
            return 0;
    }
    if (s>0)
        ++nr;
        if (nr>k)
            return 0;
    return 1;
}
int bs_left(int st, int dr)
{
    int med, last=1;
    while(st<=dr)
    {
        med=st+(dr-st)/2;
        if (incerc(med))
        {
            last=med;
            dr=med-1;
        }
        else
            st=med+1;
    }
    return last;
}
int main ()
{
    freopen("transport.in","r",stdin);
    freopen("transport.out","w",stdout);
    scanf("%d%d",&n,&k);
    int i, s=0;
    for(i=1; i<=n; ++i) {
        scanf("%d",&v[i]);s+=v[i]; }
    printf("%d\n",bs_left(1,s));
    return 0;
}