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#include <bits/stdc++.h>
typedef long long ll;
using namespace std;
int n,k,rs;
ll a[16010],st,dr;
bool ver(int v)
{ int s=0,rs=1;
for(int i=1;(i<=n)&&(rs<=k);i++){
s+=a[i];
if(s>v){rs++;s=a[i];}
}
return rs<=k;
}
int main()
{
ifstream cin("transport.in");
ofstream cout("transport.out");
cin>>n>>k;
st=1;dr=16001;
for(int i=1;i<=n;i++) cin>>a[i];
while(st<dr-3)
{
int mid=(st+dr)/2;
if(ver(mid)) dr=mid;
else st=mid;}
for(int i=st;i<=dr;i++)
if(ver(i)) return cout<<i,0;
}