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#include <fstream>
using namespace std;
ifstream fin("transport.in");
ofstream fout("transport.out");
const int NMAX=16000;
int n,k,v[NMAX];
bool esteValid(int mij){
int tr=1,copiemij=mij;
for(int i=0;i<n;i++){
if(v[i]<=mij){
mij-=v[i];
}
else{
tr++;
mij=copiemij-v[i];
}
}
if(tr<=k){
return true;
}
else{
return false;
}
}
int BinarySearchSize(int max,int sum){
int st,dr,mij;
st=max-1;
dr=sum;
while(dr-st>1){
mij=(dr+st)/2;
if(esteValid(mij)){
dr=mij;
}
else{
st=mij;
}
}
return dr;
}
int main()
{
int sum=0,max=0;
fin>>n>>k;
for(int i=0;i<n;i++){
fin>>v[i];
if(v[i]>max){
max=v[i];
}
sum+=v[i];
}
fout<<BinarySearchSize(max,sum);
return 0;
}