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#include <fstream>
#include <algorithm>
using namespace std;
int n,k,v[16005];
inline void Read()
{
int i;
ifstream fin("transport.in");
fin>>n>>k;
for(i=1;i<=n;i++)
fin>>v[i];
fin.close();
}
inline int Drumuri(int x)
{
int i,nr=1,s=v[1];
for(i=2;i<=n;i++)
{
s+=v[i];
if(s>x)
{
nr++;
s=v[i];
}
}
return nr;
}
inline void Bsearch()
{
int maxim,i,st,dr,mij,nr,sol;
maxim=v[1];
for(i=2;i<=n;i++)
maxim=max(maxim,v[i]);
st=1;dr=256000000;
ofstream fout("transport.out");
while(st<=dr)
{
mij=(st+dr)/2;
if(mij<maxim)
st=mij+1;
else
{
nr=Drumuri(mij);
if(nr<=k)
{
sol=mij;
dr=mij-1;
}
else
st=mij+1;
}
}
fout<<sol<<"\n";
fout.close();
}
int main()
{
Read();
Bsearch();
return 0;
}