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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("transport.in");
ofstream fout("transport.out");
int n,k,v[16001],L=13;
bool sepoate(int cap)
{
int i,nr=0,c=0;
for(i=1; i<=n; i++)
{
if(v[i]>cap)
return false;
if(v[i]>c)
{
nr++;
c=cap;
}
c-=v[i];
}
return nr<=k;
}
void cautare() {
int pas=1<<L;
int i=0;
while(pas!=0) {
if(!sepoate(i+pas))
i+=pas;
pas/=2;
}
fout<<i+1;
}
int main() {
int i;
fin>>n>>k;
for(i=1; i<=n; i++)
fin>>v[i];
cautare();
}