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#include <fstream>
#include <algorithm>
using namespace std;
ifstream cin("transport.in");
ofstream cout("transport.out");
int n,k,v[16005],res;
bool verif(int h)
{
int nr=0;
int s=0;
for(int i=1; i<=n; i++)
{
if(v[i]>h)
return false;
if(nr==k)
return false;
s+=v[i];
if(s>h)
{
s=v[i];
nr++;
}
}
if(s<=h && nr<k)
return true;
else
return false;
}
int main()
{
cin >> n >> k;
for(int i=1; i<=n; i++)
{
cin >> v[i];
}
int a=1,b=16005;
while(a<=b)
{
int mi=a+(b-a)/2;
if(verif(mi))
{
res=mi;
b=mi-1;
}
else
{
a=mi+1;
}
}
cout << res;
return 0;
}