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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("transport.in");
ofstream fout("transport.out");
int n,k_original,v[16001],st,dr,mij,best;
bool ok(int c)
{
int k=k_original;
int c_cur=c;
for(int i=1;i<=n;i++)
{
if(v[i]<=c_cur)
c_cur=c_cur-v[i];
else
{
k--;
if(k<=0) return false;
c_cur=c-v[i];
}
}
return true;
}
int main()
{
int s=0;
fin>>n>>k_original;
for(int i=1;i<=n;i++)
{
fin>>v[i];
s+=v[i];
}
st=1;
dr=s;
mij=st+(dr-st)/2;
while(st<=dr)
{
mij=st+(dr-st)/2;
if(ok(mij))
{
best=mij;
dr=mij-1;
}
else st=mij+1;
}
fout<<best;
return 0;
}