#include <fstream>
using namespace std;

#define NMax 16005

ifstream f("transport.in");
ofstream g("transport.out");

long long cap=(1LL<<62),step;
int n,k;
int v[NMax];

int verif(long long c)
{
    long long val=0;
    int nr=1;
    for(int i=1;i<=n;i++)
    {
        if(v[i]>c) return 0;
        if(val+v[i]<=c) val+=(long long)v[i];
        else val=(long long)v[i],nr++;
    }

    if(nr>k) return 0;
    return 1;
}

int main()
{
    int i;
    f>>n>>k;
    for(i=1;i<=n;i++) f>>v[i];

    for(step=cap;step;step>>=1) if( verif(cap-step) ) cap-=step;

    g<<cap<<"\n";

    f.close();
    g.close();
    return 0;
}