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#include <iostream>
#include <fstream>
using namespace std;
ifstream f("transport.in");
ofstream g("transport.out");
#define cout g
int n,k,v[16000];
bool verifica(int volum)
{
int s=0,i=0,nrt=0;
for(i=0; i<n; ++i)
{
if (s+v[i]>volum)
{
++nrt;
s=0;
--i;
}
else s+=v[i];
}
if(s>0) ++nrt;
return nrt<=k;
}
int caut(int st, int dr)
{
if(st>dr) return st;
int m;
m=(st+dr)/2;
if(verifica(m)) return caut(st,m-1);
else return caut(m+1,dr);
}
int main ()
{
int st(0),dr(0),m,i;
f>>n>>k;
for(i=0; i<n; ++i)
{
f>>v[i];
st=max(st,v[i]);
dr+=v[i];
}
cout<<caut(st,dr);
//cout<<'\n'<<verifica(7);
return 0;
}