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#include <iostream>
using namespace std;
int v[16005],st,dr,n,k;
bool incape(int dimensiune){
int drum=1,s=0;
for(int j=0;j<n;j++)
{
if(s+v[j]<=dimensiune)
{
s+=v[j];
}
else
{
drum++;
s=v[j];
}
}
return drum<=k;
}
int binSearch(int st, int dr) {
int ans=0;
while(st<=dr) {
int med=(st+dr)/2;
if(incape(med)==true) {
dr=med-1;
ans=med;
}
else {
st=med+1;
}
}
return ans;
}
int main()
{
cin>>n>>k;
for(int i=0;i<n;i++)
{
cin>>v[i];
}
int max=0;
for(int i=0;i<n;i++)
{
if(v[i]>max);
{
max=v[i];
}
}
cout<<binSearch(max, 16000*16000);
return 0;
}