#include <bits/stdc++.h>
using namespace std;
ifstream in("transport.in");
ofstream out("transport.out");
#define DIM 16003
int main(){
    int n,k,v[DIM],Max,s;
    in>>n>>k;
    s=0;
    Max=0;
    for(int i=1;i<=n;i++){
        in>>v[i];
        if(v[i]>Max)
            Max=v[i];
        s+=v[i];
    }
    int st=Max,dr=s,sol=0;
    int mid=(st+dr)/2;
    int nr=1,sum=0;
    while(st<=dr)
    {
        mid=(st+dr)/2;
        nr=1,sum=0;
        for(int i=1; i<=n; i++)
            if(sum+v[i]<=mid)
                sum+=v[i];
            else
            {
                nr++;
                sum=v[i];
            }
        if(nr<=k)
        {
            sol=mid;
            dr=mid-1;
        }
        else
            st=mid+1;

    }

    out<<sol;
    return 0;
}