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#include <fstream>
using namespace std;
long long n, k, i, st, dr, mij, v[16003], s, nr;
int main()
{
ifstream fin("transport.in");
ofstream fout("transport.out");
fin>>n>>k;
for(i=1;i<=n;i++)
fin>>v[i];
st=1;
dr=256000000;
while(st<=dr){
nr=1;
mij=(st+dr)/2;
for(i=1;i<=n;i++){
s+=v[i];
if(s>mij){
nr++;
s=v[i];
}
}
if(nr>k)
st=mij+1;
else
dr=mij-1;
s=0;
}
fout<<st;
return 0;
}