#include<stdio.h>
int v[16001];
int main()
{
    int n,k,i,s=0,max=0,l1,l2,nr,m;
    freopen("transport.in","r",stdin);
    freopen("transport.out","w",stdout);
    scanf("%d%d",&n,&k);
    for(i=1;i<=n;i++)
    {
        scanf("%d",&v[i]);
        s=s+v[i];
        if(v[i]>max)
            max=v[i];
    }
    l1=max-1;
    l2=s+1;
    while(l1<=l2)
    {
        m=(l1+l2)/2;
        nr=1;
        s=0;
        for(i=1;i<=n;i++)
        {
            if(s+v[i]<=m)
                s=s+v[i];
            else
            {
                nr++;
                s=v[i];
            }

        }
        if(nr<=k)
            l2=m-1;
        else
            l1=m+1;
    }
    printf("%d",m);
    return 0;
}