#include <iostream>
#include <fstream>

using namespace std;
string file = "transport";
ifstream fin(file + ".in");
ofstream fout(file + ".out");
int n, k, v[16006], x;

inline bool capacitate(long long val){
    long long s = 0, nr = 0;
    for( int i = 1; i <= n; ++i){
        s+=v[i];
        if(v[i] > val)
            return 0;
        if( s + v[i+1] > val ){
            nr++;
            s = 0;
        }
    }
    nr++;
    if(nr <= k)
        return 1;
    return 0;
}

inline void citire(){
    fin>>n>>k;
    for( int i = 1; i <= n; ++i ){
        fin>>v[i];
//        v[i] = v[i-1] + x;
    }
}


int main(){
    citire();
// caut capacitatea minima
    long long st = 1;
    long long dr = 16000 * 16000;
    while( st <= dr ){
        long long mid = (st + dr) / 2;
        if(capacitate(mid))
            dr = mid-1;
        else
            st = mid + 1;
    }
    fout<<st;
    return 0;
}