#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;
}