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#include <fstream>
using namespace std;
ifstream cin("transport.in");
ofstream cout("transport.out");
int v[16001];
int main()
{
long long S=0;
int N,K,i,s,mij,st,dr,sol,nrt,maxi=0;
cin>>N>>K;
for(i=1;i<=N;i++)
{
cin>>v[i];
S=S+v[i];
if(maxi<v[i])
{
maxi=v[i];
}
}
st=maxi;
dr=S;
sol=1;
while(st<=dr)
{
mij=(st+dr)/2;
nrt=1;
s=0;
for(i=1;i<=N;i++)
{
if(s+v[i]<=mij)
{
s=s+v[i];
}
else
{
nrt++;
s=v[i];
}
}
if(nrt<=K)
{
sol=mij;
dr=mij-1;
}
else
{
st=mij+1;
}
}
cout<<sol;
return 0;
}