#include <fstream>
#include <algorithm>
using namespace std;
ifstream cin("nrtri.in");
ofstream cout("nrtri.out");
int n,m,i,j,k,s,rez,st,dr,mid,last,sum,nr,maxim;
int v[16010];
int main () {
    cin>>n>>k;
    for (i=1;i<=n;i++) {
        cin>>v[i];
        s+=v[i];
        maxim=max(maxim,v[i]);
    }
    st=maxim;
    dr=s;
    while (st<=dr) {
        mid=(st+dr)/2;
        sum=0;
        nr=0;
        for (i=1;i<=n;i++) {
            sum+=v[i];
            if (sum==mid) {
                nr++;
                sum=0;
            }
            if (sum>mid) {
                nr++;
                sum=0;
                i--;
            }
        }
        if (nr<k) {
            dr=mid-1;
        }
        else {
            st=mid+1;
        }
    }
    cout<<st;
}