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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("transport.in");
ofstream fout("transport.out");
int L=30, n, v[16002], k;
bool is_valid(int c)
{
int nr=0, cc=0, i;
for(i = 0; i < n; i++)
{
if(v[i] > cc)
{
nr++;
cc = c;
}
if(v[i] > cc) return false;
cc -= v[i];
}
return (nr <= k);
}
int binary_search(int x)
{
int pas = 1 << L , r=0;
while(pas)
{
if( !is_valid(r + pas) ) r+=pas;
pas /= 2;
}
return r + 1;
}
int main()
{
int i;
fin >> n >> k;
for(i = 0; i < n; i++)
{
fin >> v[i];
}
fout << binary_search(k);
}