#include <fstream>

using namespace std;
ifstream fin("transport.in");
ofstream fout("transport.out");
int n,k,v[16001],st,i,s,dr,Max,mid,sum,nr,sol;
int main()
{
    fin>>n>>k;
    for(i=1;i<=n;i++){
        fin>>v[i];
        s=s+v[i];
        if(v[i]>Max)
            Max=v[i];
    }
    st=Max;
    dr=s;
    while(st<=dr){
        mid=(st+dr)/2;
        sum=0;
        nr=1;
        for(i=1;i<=n;i++){
            if(sum+v[i]<=mid)
                sum=sum+v[i];
            else{
                nr++;
                sum=v[i];
            }
        }
        if(nr<=k){
            sol=mid;
            dr=mid-1;
        }
        else
            st=mid+1;
    }
    fout<<sol;
    return 0;
}