#include <cstdio>
using namespace std;
const int NMAX=16005;
int v[NMAX];
int n,k;
bool ok(int c)
{
    int tr=1,i=1,s=0;
    while(i<=n)
    {
        if(v[i]>c)
            return 0;
        s=s+v[i];
        if(s>c)
        {
            tr++;
            s=v[i];
        }
        i++;
    }
    if(tr<=k)
        return 1;
    else
        return 0;
}
int bsL(int st,int dr)
{
    int med,last=-1;
    while(st<=dr)
    {
        med=(st+dr)/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,s=0;
    scanf("%d%d",&n,&k);
    for(i=1;i<=n;i++)
    {
        scanf("%d",&v[i]);
        s=s+v[i];
    }
    printf("%d",bsL(1,s));
    return 0;
}