#include <cstdio>

using namespace std;

const int NMAX = 1605;
int v[NMAX];
int n,k;
bool ok(int C)
{
    int tr,i,sc;
    tr = sc = 0;
    for(i = 1;i <= n;i++)
    {
        if(v[i] > C)
            return 0;
        if(sc + v[i] <= C)
            sc = sc + v[i];
        else
        {
            tr++;
            sc = v[i];
        }
    }
    if(sc > 0)
        tr++;
    return tr <= k;
}

int bs_left(int st,int dr)
{
    int med,last = -1;
    while(st <= dr)
    {
        med = st + (dr - st) / 2;
        if(ok(med))
        {
            last = med;
            dr = med - 1;
        }
        else
            st = med + 1;
    }
    return last;
}
int main()
{
    freopen("transport.in","r",stdin);
    freopen("transport.out","w",stdout);
    int i,ans,smax = 0;
    scanf("%d%d",&n,&k);
    for(i = 1;i <= n;i++)
    {
        scanf("%d",&v[i]);
        smax = smax + v[i];
    }
    ans = bs_left(1,smax);
    printf("%d",ans);
    return 0;
}