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#include <fstream>
using namespace std;
ifstream fin("transport.in");
ofstream fout("transport.out");
const int NMAX=16000;
int sp[NMAX+5];
int k, sol, n;
bool transport(int cap)
{
int i, j, nr=0;
if(cap<sp[1])
return 0;
for(i=1;i<=n;i++)
{
j=i;
while(sp[j]-sp[i-1]<=cap and j<=n)
{
j++;
}
j--;
i=j;
nr++;
}
if(nr<=k)
return 1;
else
return 0;
}
void cautare_binara(int st, int dr)
{
int mij;
sol=dr;
bool ok;
while(st<=dr)
{
mij=(st+dr)>>1;
ok=transport(mij);
if(ok==1)
{
sol=min(sol, mij);
dr=mij-1;
}
else
st=mij+1;
}
}
int main()
{
int i;
fin>>n>>k;
for(i=1;i<=n;i++)
{
fin>>sp[i];
sp[i]=sp[i]+sp[i-1];
}
cautare_binara(1, sp[n]);
fout<<sol<<"\n";
return 0;
}