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#include<fstream>
using namespace std;
ifstream f("transport.in");
ofstream g("transport.out");
int n,k,a[17000],poz;
bool tr(int &i,int &nr,int x)
{
if(i>n)
return true;
int s=0;
bool ok=false;
while(s+a[i]<=x&&i<=n)
{
s=s+a[i];
i++;
ok=true;
}
nr++;
if(!ok||nr>k)
return false;
return tr(i,nr,x);
}
int main()
{
f>>n>>k;
for(int i=1;i<=n;i++)
f>>a[i];
int st=0;int dr=256000000;
while(st<=dr)
{
int m=(st+dr)/2,i=1,nr=0;
if(tr(i,nr,m))
{
poz=m;
dr=m-1;
}
else
st=m+1;
}
g<<poz;
f.close();g.close();
return 0;
}