#include <stdio.h>

int n,k,i,v[16010];
long min,max,s=0,nr,suma,si;

int main()
{
	freopen("transport.in","r",stdin);
	freopen("transport.out","w",stdout);
	scanf("%d%d",&n,&k);
	for(i=1;i<=n;i++){
		scanf("%d",&v[i]);
		if(v[i]>s){
			s=v[i];
		}
		max+=v[i];
	}
	min=s;
	while(min<max){
		nr=(min+max)/2;
		suma=0;
		si=0;
		for(i=1;i<=n;i++){
			if(suma<nr){
				suma+=v[i];
			}else{
				si++;
				//printf("%ld\n",suma);
				suma=v[i-1];
			}
			if(i==n){
				si++;
			}
		}
		if(si<k){
			max=nr-1;
		}else{
			min=nr+1;
		}
		//printf("%d\n\n",nr);
	}
	printf("%ld",nr+1);
	return 0;
}