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#include <fstream>
using namespace std;
const int NMAX=16000;
int n,v[NMAX],k;
ifstream in("transport.in");
ofstream out("transport.out");
bool se_poate(int c)
{
int cc=0,nrt=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 c=1;
int st=1,dr=NMAX*NMAX;
while(st<dr)
{
int m=(st+dr)/2;
if(se_poate(m))
{
dr=m;
}
else
{
st=m+1;
}
}
out<<st;
in.close();
return 0;
}