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#include <fstream>
using namespace std;
ifstream f("transport.in");
ofstream g("transport.out");
int n,k,st,dr,mij,i,v,acum,a[16005];
int main()
{
f>>n>>k;
k=min(n,k);
for(i=1;i<=n;++i)
{
f>>a[i];
st=max(st,a[i]);
}
dr=16000*16000;
while(st<=dr)
{
mij=(st+dr)/2;
acum=0;v=1;
for(i=1;i<=n;++i)
if(acum+a[i]<=mij) acum+=a[i];
else
{
++v;
acum=a[i];
}
if(v>k) st=mij+1;
else dr=mij-1;
}
g<<st<<'\n';
return 0;
}