#include <cstdio>
using namespace std; 
int n,k,i,v[16010];
long min,max,s=0,nr,suma,si,nrj,sol;
 
void read()
{
	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];
    }
}

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

int main()
{
	read();
	rez();
	return 0;
}