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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("transport.in");
ofstream fout("transport.out");
int n,k,v[16009],i,s,st,dr,mij,cmij,maxx,cont;
int main()
{
fin>>n>>k;
for(i=1;i<=n;i++)
fin>>v[i];
for(i=1;i<=n;i++)
{
s=s+v[i];
if(v[i]>maxx)
maxx=v[i];
}
st=maxx;
dr=s;
mij=(dr+st)/2;
while(st!=mij && dr!=mij)
{
cmij=mij;
cont=0;
for(i=1;i<=n;i++)
{
if(v[i]<cmij)
cmij=cmij-v[i];
else
{
cmij=mij;
cmij=cmij-v[i];
cont++;
}
}
if(cont<k)
{
dr=mij;
mij=(st+dr)/2;
}
else
{
st=mij;
mij=(st+dr)/2;
}
}
fout<<mij;
fin.close();
fout.close();
return 0;
}