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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("transport.in");
ofstream fout("transport.out");
const int nmax=16000;
int main()
{
int n, k;
fin >> n >> k;
int v[nmax];
for(int i=0; i<n; i++) fin >> v[i];
int st=1, dr=nmax, mij, s, cnt;
while(st<dr)
{
mij=(st+dr)/2;
s=0; cnt=1;
for(int i=0; i<n; i++)
{
if(s+v[i] > mij)
{
s=0;
cnt++;
}
s+=v[i];
}
if(cnt<=k) dr=mij;
else st=mij+1;
}
fout << st;
return 0;
}