#include <fstream>
using namespace std;
ifstream fin("transport.in");
ofstream fout("transport.out");
int n,k,i,maxim,s,st,dr,c,cc,v[16001];
int main(){
    fin>>n>>k;
    for(i=1;i<=n;i++){
        fin>>v[i];
        s+=v[i];
        if(v[i]>maxim)
            maxim=v[i];
    }
    st=maxim;
    dr=s;
    while(st<=dr){
        c=(st+dr)/2;
        cc=c-v[1];
        tr=1;
        for(i=2;i<=n;i++)
            if(cc>=v[i])
                cc-=v[i];
            else{
                tr++;
                cc=c-v[i];
            }
        if(tr>k)
           st=c+1;
        else
            dr=c-1;
    }
    fout<<st;
    return 0;
}