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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("transport.in");
ofstream fout("transport.out");
int n,t,v[16001];
int main()
{
fin >> n >> t;
int i,maxim=-1,mij,poz;
for(i=1;i<=n;i++)
{
fin >> v[i];
if(v[i]>maxim)
maxim=v[i];
}
int st=maxim;
long long int dr=256000000;
while(st<=dr)
{
mij=(st+dr)/2;
int sum=0,nrmij=1;
for(i=1;i<=n;i++)
{
if (sum + v[i] > mij)
{
sum = v[i];
nrmij++;
}
else sum += v[i];
}
if(nrmij<=t)
{
dr=mij-1;
poz=mij;
}
else st=mij+1;
}
fout << poz;
return 0;
}