#include <iostream>
#include <cstdio>
 
using namespace std;
 
int v[16001];
 
int main()
{
    int n,k,i,c,st=0,dr,m,nr,p,x;
    freopen("transport.in","r",stdin);
    freopen("transport.out","w",stdout);
    cin>>n>>k;
    for(i=1;i<=n;i++)
    {
        cin>>nr;
        if(nr>st)
            st=nr;
        v[i]=v[i-1]+nr;
    }
    dr=v[n];
    while(st<=dr)
    {
        m=(st+dr)/2;
        i=1;
        x=0;
        p=0;
        while(i<=n)
        {
            x++;
            while(v[i]-v[p]<=m && i<=n)
                i++;
            p=i-1;
        }
        if(x>k)
            st=m+1;
        else
        {
            c=m;
            dr=m-1;
        }
    }
    cout<<c;
    return 0;
}