#include<stdio.h>
FILE*fin,*fout;
long int n, k,k1,i,v[20000],min,t,u,p,m,nr,max;
 int main(){
fin=fopen("transport.in","r");
fout=fopen("transport.out","w");
fscanf(fin,"%ld %ld",&n,&k);
for(i=1;i<=n;i++){
 fscanf(fin,"%ld ",&v[i]);
 k1=k1+v[i];
 if(v[i]>max){max=v[i];}


}
 u=max; p=k1;
 min=16001;

 while(u<=p){
	m=(u+p)/2;
 t=v[1]; nr=1;
	 for(i=2;i<=n;i++){
	 if(v[i]+t>=m){nr++;if(v[i]+t>m){t=v[i];}
	 if(v[i]+t==m){t=0;}
	 }
	     else{t=t+v[i];}



	 }
 if(nr>k){u=m+1;}
 if(nr<=k){
 if(m<min){min=m;p=m-1;}

 }


 }
fprintf(fout,"%ld",min);
return 0;
}