#include <stdio.h>
#include <stdlib.h>

int v[16001];
int main()
{
    FILE *fin, *fout;
    int n, k, i;
    int s, max;
    int st, dr, mij, t;
    int nr;
    fin = fopen ( "transport.in", "r" );
    fscanf ( fin, "%d%d", &n, &k );
    fout = fopen ( "transport.out", "w" );
    max = 0;
    s = 0;
    for ( i = 1; i <= n; i ++ ){
       fscanf ( fin, "%d", &v[i] );
       if ( max < v[i] )
         max = v[i];
       s = s + v[i];
    }
    st = max;
    dr = s;

    while ( st <= dr){
       mij = ( st + dr ) / 2;
       s = 0;
       t = 1;
       i = 1;
       while ( i <= n ){
          s = s + v[i];
          if ( s > mij ){
            s = 0;
            t++;
          }
          else
            i++;
       }
       if ( t > k )
         st=mij+1;
       else {
         nr = mij;
         dr = mij - 1;
       }

    }
    fprintf ( fout, "%d", nr  );
    return 0;
}