#include <iostream>
#include <fstream>
using namespace std;
ifstream f("transport.in");
ofstream g("transport.out");
int n,k,i,v[16001],st,dr,s,capa,m,x;
int main()
{
    f>>n>>k;
    for(i=1;i<=n;i++)
{
    f>>v[i];
    dr=dr+v[i];
    if(v[i]>st)
st=v[i];
}
dr++;
while(st<=dr)
{
m=(st+dr)/2;x=1;s=0;
for(i=0;i<n;){

if(s+v[i+1]<=m)
s=s+v[++i];
else{
s=0;x++;}
}
if(x<=k)
{
capa=m;
dr=m-1;
}
else
{
st++;
}
}
g<<capa;
return 0;
}