#include<stdio.h>
int n,k,i,j,smin,s=0,v[16010];
int sol(int t)
{
    int i,j=0,st=1,dr=s,m,z=0;
    smin=s;
    while(st<=dr)
    {
        m=(st+dr)/2;
        for(i=1;i<=n;i++)
        {
            if(z+v[i]<=m)z+=v[i];
            else
            {
                z=0;
                j++;
                i--;
            }
            if(i==n)j++;
            if(j>t)break;
        }
        if(j<=t)
        {
            if(m<smin)
            {
                smin=m;
                dr=smin-1;
            }
        }else
        {
            st=m+1;
        }
        j=0;
        z=0;
    }
    return smin;

}
int main()
{
    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+=v[i];
    }
    sol(k);
    printf("%d",smin);
    return 0;
}