#include <bits/stdc++.h>
#define Dim 16001
using namespace std;
ifstream f("transport.in");
ofstream g("transport.out");
long N,K,Saltele[Dim],sum,maxim;
long drum,solutie,mij,stop;

int main()
{
    f>>N>>K;
    for(int i=1;i<=N;i++)
    {
        f>>Saltele[i];
        maxim=max(maxim,Saltele[i]);
    }
    long st=1,dr=16000*N;
    while(st<dr)
    {
        drum=0,sum=0,stop=1;
        mij=(st+dr)/2;
        for(int i=1;i<=N;i++)
        {
            stop=1;
            sum+=Saltele[i];
            if(sum>mij)
            drum++,sum=Saltele[i],stop=0;
            if(i==N&&sum<=mij&&stop==1) drum++;
            if(drum>K) break;
        }
        if(drum==K) solutie=mij;
        if(drum<=K) dr=mij-1;
        else
        st=mij+1;
    }
    g<<solutie;
    return 0;
}