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include <fstream>
using namespace std;
ifstream fin("transport.in");
ofstream fout("transport.out");
int v[16001],n,k;
const int L=27;
bool sepoate(int x)
{
int i,cc=0,nr=0;
for(i=1;i<=n;i++)
{
if(v[i]>cc)
{
nr++;
cc=x;
}
if(v[i]>cc) return false;
if(nr>k) return false;
cc-=v[i];
}
return true;
}
int main()
{
int pas,i,r;
pas=1<<L;
r=0;
fin>>n>>k;
for(i=1;i<=n;i++)
fin>>v[i];
while(pas!=0)
{
if(!sepoate(r+pas)) r+=pas;
pas/=2;
}
r++;
fout<<r;
return 0;
}