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#include <iostream>
#include <fstream>
using namespace std;
ifstream in("transport.in") ;
ofstream out("transport.out") ;
const int NMAX=16000;
int v[NMAX] , n , k;
bool incap (int c)
{
int nrt=0 ,cc=0 ;
for (int i=0 ; i<n ; i++)
{
if (v[i]>c)
{
return false;
}
if (v[i]>cc)
{
nrt++;
cc=c;
}
cc-=v[i];
}
return(nrt<=k);
}
int main()
{
in>>n>>k;
for (int i=0 ; i<n ; i++)
{
in>>v[i];
}
int r=0 , pas=1<<27;
while (pas!=0)
{
if (!incap(r+pas))
{
r+=pas;
}
pas/=2;
}
out<<r+1;
return 0;
}