#include <fstream>
#include <algorithm>
using namespace std;
ifstream fin("transport.in");
ofstream fout("transport.out");
int n, k, s,v[16001], i, st, dr, sum, aux, mini, mid;
void suma(int m){
    for(i=1;i<=k;i++){
            sum=0;
            while(sum+v[aux]<=m && aux<=n){
                sum+=v[aux];
                aux++;
            }
        }
}
int main(){
    fin>>n>>k;
    for(i=1;i<=n;i++){
        fin>>v[i];
        s+=v[i];
    }
    st=1;
    dr=s;
    while(st<=dr){
        mid=(st+dr)/2;
        aux=1;
        suma(mid);
        if(aux>n){
            dr=mid-1;
            mini=mid;
        }else
            st=mid+1;
    }
    fout<<mini;
}
/*
6 3
7
3
2
3
1
4


s=20

mini=8;

*/