#include <fstream>

using namespace std;

ifstream cin("transport.in");
ofstream cout("transport.out");

int v[16001];
int n;

int nrdrumuri(int c){
    int i = 1;
    int sum = 0;
    int transport = 1;
    while(i <= n){
        if(sum + v[i] <= c){
            sum = sum + v[i];
            i++;
        }
        else{
            transport++;
            sum = 0;
        }
    }
    return transport;
}

int main()
{
    int k;
    cin >> n >> k;
    for(int i = 1; i <= n; i++){
        cin >> v[i];
    }
    int mini = -1;
    int maxi = 0;
    for(int i = 1; i <= n; i++){
        if(v[i] > mini)
            mini = v[i];
        maxi += v[i];
    }
    int st = mini;
    int dr = maxi;
    int sol = 0;
    while(st <= dr){
        int mijl = (st+dr)/2;
        if(nrdrumuri(mijl) > k){
            st = mijl+1;
        }
        else{
            sol = mijl;
            dr = mijl-1;
        }
    }
    cout << sol;
    return 0;
}