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#include <iostream>
#include <fstream>
using namespace std;
int n,k,a[16010],suma,maxim;
void citire()
{
ifstream fin("transport.in");
fin>>n>>k;
for(int i=1;i<=n;i++)
{
fin>>a[i];
suma+=a[i];
maxim=max(maxim,a[i]);
}
fin.close();
}
int verif(int g)
{
int i,c=0,tr=0;
for(i=1;i<=n;i++)
{
c+=a[i];
if(c+a[i+1] > g)
{
tr++;
c=0;
}
}
tr++;
if(tr > k) return 0;
else return 1;
}
int cautare(int st, int dr)
{
int mij,rasp=0;
while(st<=dr)
{
mij=(st+dr)>>1;
//cout<<mij<<" ";
if(verif(mij))
{
dr=mij-1;
rasp=mij;
}
else st=mij+1;
}
return rasp;
}
void afisare()
{
int min;
min=cautare(maxim,suma);
ofstream fout("transport.out");
fout<<min<<"\n";
fout.close();
}
int main()
{
citire();
afisare();
return 0;
}