#include <stdio.h>
#define MAXNK 16000
int v[MAXNK];

char bun(int nr, int n, int k){
  int i = 0, sum;
  while(i < n){
    sum = 0;
    while(sum <= nr && i < n){
      sum += v[i];
      i++;
    }
    if(sum > nr)  i--;
    k--;
    if(k == -1)  return 0;
  }
  return 1;
}

int main(){
  FILE *in = fopen("transport.in", "r");
  int n, k;
  fscanf(in, "%d%d", &n, &k);
  int i;
  for(i = 0; i < n; i++){
    fscanf(in, "%d", &v[i]);
  }
  fclose(in);
  int rez = 0, pas = 1 << 14;
  while(pas > 0){
    if(!bun(rez + pas, n, k))  rez += pas;
    pas /= 2;
  }
  FILE *out = fopen("transport.out", "w");
  fprintf(out, "%d", rez + 1);
  fclose(out);
  return 0;
}