#include <fstream>
using namespace std;
int n,k,s,mmax,i,v[16005],st,dr;
int main()
{
    ifstream f("transport.in");
    ofstream g("transport.out");
    f>>n>>k;
    for(i=1;i<=n;i++)
    {
        f>>v[i];
        s+=v[i];
        if(mmax<v[i]) mmax=v[i];
    }
    st=mmax-1,dr=s+1;
    int sm=0,trans=1,mij,i;
    while(st+1<dr)
    {
        mij=(st+dr)/2;
        sm=0;trans=1;
        for(i=1;i<=n && trans<=k;i++)
        {
            if(sm+v[i]<=mij) sm+=v[i];
            else sm=v[i],trans++;
        }
        if(trans>k) st=mij;
        else dr=mij;
    }
    g<<dr;
    return 0;
}