#include<stdio.h>
#define MAX 100000
typedef long long llong;
int n,k;
llong T[MAX];
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 = (left + right) / 2;
		int v = check(mid);
		if(v >= n){
			right = mid;
		}
		else{
			left = mid;
		}
	}
		return right;
	
}
int main (void){
	scanf("%d %d",&n,&k);
	for(int i = 0; i < n;i++){
		scanf("%d",&T[i]);
	}
	llong ans = solve();
	printf("%d\n",ans);
}

