#include <stdio.h>

int n,k,i,a[16010];
long min,max,s=0,nr,suma,si,nrj,sol,num;

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",&a[i]);
		if(a[i]>s)
		{
			s=a[i];
		}
		max+=a[i];
	}
	min=s;
	while(min<=max){
		nr=(min+max)/2;
		num=n;
		si=0;
		i=1;
		while(i<=n){
			si++;
			while(i<=n && a[i]<=nrj){
				nrj-=a[i];
				i++;
			}
			nrj=nr;
		}
		if(si<=k){
			max=num-1;
			sol=num;
		}else{
			min=num+1;
		}
	}
	printf("%ld",sol);
	return 0;
}