#include <fstream>
 
using namespace std;
 
ifstream in("transport.in");
ofstream out("transport.out");
 
short n, k, v[16001], i, mi;
int mx;
 
int cautbin(short v[], short n, int st, int dr, short k)
{
    int m, s, t;
    short i;
    while(st<dr)
    {
        m=st+(dr-st)/2;
        s=0;
        t=1;
        for(i=1; i<=n; i++)
        {
            if(s+v[i]<=m) s+=v[i];
            else
            {
                t++;
                s=v[i];
            }
        }
        if(t>k) st=m+1;
        else dr=m;
    }
    return st;
}
int main()
{
    in>>n>>k;
    mi=0;
    for(i=1; i<=n; i++)
    {
        in>>v[i];
        mx+=v[i];
        if(mi<v[i]) mi=v[i];
    }
    out<<cautbin(v, n, mi, mx, k);
    return 0;
 
}