#include <stdio.h>
#define MAX 100000
typedef long long llong;
int n,k;
llong T[MAX];

int check(llong P);
int solve();

int main(void){
	scanf("%d",&n);
	scanf("%d",&k);
	for(int i=0;i<n;i++){
		scanf("%d",&T[i]);
	}
	llong ans=solve();
	printf("%d\n",ans);
	return 0;
}



int check(llong P){
	int i=0;
	for(int j=0;j<k;j++)
	{
		llong s=0;
		while(s+T[i]<=P)
		{
			s +=T[i];
			i++;
			if(i==n){
				return n;
			}
		}
	}
	return i;
}

int solve(){
	llong left=0;
	llong right=100000*10000;
	llong mid;
	while(right-left>1)
	{
		mid=(right+left)/2;
		int v=check(mid);
		if(v>=n){
			right=mid;
		}
		else{
			left = mid;
		}
	}
	return right;
}



