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

int main()
{
    //freopen("transport.in","r",stdin);
    //freopen("transport.out","w",stdout);
    FILE *f=fopen("transport.in","r"),*g=fopen("transport.out","w");
    int n,k,*a,i,cap,max=0,s=0,nr,ok,aux;
    fscanf(f,"%d %d",&n,&k);
    a=malloc(n*sizeof(int));
    for(i=0;i<n;i++)
    {
        fscanf(f,"%d",&a[i]);
        if(a[i]>max) max=a[i];
        s+=a[i];
    }
    if(s/k>max) cap=s/k;
        else cap=max;
    nr=0;ok=1;aux=cap;
    while(ok)
    {
        if(aux-a[i]>=0) aux-=a[i];
            else {nr++;
                 aux=cap-a[i];
                 }
        if(nr>k) {cap++;
                 aux=cap;
                 i=0;
                 nr=0;
                 }
        if(i==n-1) ok=0;
        i++;
    }
    fprintf(g,"%d",cap);
    fclose(f);
    fclose(g);
    return 0;
}