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#include <fstream>
using namespace std;
ifstream fin ("transport.in");
ofstream fout("transport.out");
int n,k,V[16005],st,dr,mid,i;
bool ok(int x)
{
int nr=1;
int S=V[1];
for(int j=2;j<=n;j++)
{
if(S+V[j]<=x)
S=S+V[j];
else
{
S=V[j];
nr++;
}
}
if(nr>k)
return 0;
else
return 1;
}
int main()
{
fin>>n>>k;
for(i=1;i<=n;i++)
{
fin>>V[i];
st=max(st,V[i]);
dr=dr+V[i];
}
while(st<=dr)
{
mid=(st+dr)/2;
if(ok(mid))
dr=mid-1;
else
st=mid+1;
}
fout<<st;
return 0;
}