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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("transport.in");
ofstream fout("transport.out");
int n, k, a[16004], sum, maxi;
void Read()
{
fin >> n >> k;
for(int i=1; i<=n; i++)
fin >> a[i];
}
int main()
{
Read();
int st, dr, mij, i, cnt, nr = 0;
st = 0.;
dr = 16000;
while(st <= dr)
{
mij = (st + dr)/2;
cnt = 0;
sum = 0;
for(i=1; i<=n; i++)
{
if(sum + a[i] <= mij && a[i] <= mij) sum += a[i];
else cnt++, sum = a[i];
if(a[i] > mij) cnt = k + 1;
}
if(sum <= mij) cnt++;
if(cnt > k) st = mij + 1;
else if(cnt <= k ) dr = mij - 1, nr = mij;
// else if(cnt == k) nr = mij, dr = mij - 1;
}
fout << nr;
return 0;
}