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#include <fstream>
using namespace std;
const int NMAX=16000;
int v[NMAX+5];
int n,k;
ifstream fin("transport.in");
ofstream fout("transport.out");
bool ok(int C)
{
int i,sc,tr;
sc=tr=0;
for(i=1;i<=n;i++)
{
if(v[i]>C)
return 0;
if(sc+v[i]<=C)
sc=sc+v[i];
else
{
tr++;
sc=v[i];
}
}
tr++;
return tr<=k;
}
int bsL(int st,int dr)
{
int med,last=-1;
while(st<=dr)
{
med=(st+dr)/2;
if(ok(med))
{
last=med;
dr=med-1;
}
else
st=med+1;
}
return last;
}
int main()
{
int i,s;
fin>>n>>k;
s=0;
for(i=1;i<=n;i++)
{
fin>>v[i];
s=s+v[i];
}
fout<<bsL(1,s);
return 0;
}