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#include <iostream>
#include <fstream>
using namespace std;
ifstream f("transport.in");
ofstream g("transport.out");
const int N=16001,L=27;
int n,k,v[N];
bool sepoate(int c)
{
int i,nr=0,cc=0;
for (i=1;i<=n;i++)
{
if (v[i]>cc)
{
nr++;
cc=c;
}
if (v[i]>cc)
{
return false;
}
cc-=v[i];
}
if (nr>k)
return false;
else return true;
}
int cb ()
{
int r=0,pas=1<<L;
while (pas!=0)
{
if (!sepoate(r+pas))
{
r+=pas;
}
pas/=2;
}
r++;
return r;
}
int main()
{
int i;
f>>n>>k;
for (i=1;i<=n;i++)
{
f>>v[i];
}
g<<cb();
return 0;
}