#include <stdio.h>
#include <stdlib.h>
int v[16000];
int main()
{
    FILE *fin, *fout;
    fin = fopen("transport.in", "r");
    fout = fopen("transport.out", "w");
    int n, k, a, i, mx, mi, mij, sum;
    fscanf(fin, "%d %d", &n, &k);
    mi = mx = 0;
    for(i = 0 ; i < n; i ++){
      fscanf(fin, "%d", &v[i]);
      if(mi < v[i]){
        mi = v[i];
      }
    }
    mx = mi * n;
    mij = 0;
    while(mi < mx  &&  mi != (mi + mx) / 2){
      mij = (mi + mx) / 2;
      sum = 0;
      a = 1;
      for(i = 0; i < n; i++){
        if(sum + v[i] <= mij){
          sum += v[i];
        }else{
          a++;
          sum = v[i];
        }
      }
      if(a <= k){
        mx = mij;
      }else{
        mi = mij;
      }
    }
    fprintf(fout, "%d", mx);
    fclose(fin);
    fclose(fout);
    return 0;
}