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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,i=1,s;
while(i<=n)
{
s=0;
while(s<h && i<=n)
s+=v[i++];
if(s>h){
s-=v[--i];
}
nr++;
}
if(nr>k)
return false;
else
return true;
}
int main()
{
cin >> n >> k;
int a=0,b=0;
for(int i=1; i<=n; i++)
{
cin >> v[i];
if(v[i]>a)
a=v[i];
b+=v[i];
}
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;
}