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#include <iostream>
using namespace std;
int v[16001];
int main()
{
int n, k, s, st, dr, mij, max, cnt, sum, sol;
cin>>n>>k;
s=0;
max=-1;
for (int i=0; i<n; i++)
{
cin>>v[i];
if(v[i]>max)
max=v[i];
s+=v[i];
}
st=max;
dr=s;
while (st<=dr)
{
mij=(st+dr)/2;
// cout<<st<<" "<<dr<<" "<<mij<<endl;
cnt=0;
for (int i=0; i<n && cnt<=k; i++)
{
if (sum>mij)
{
cnt++;
sum=0;
}
sum+=v[i];
}
if (cnt>k)
st=mij+1;
else
{
sol=mij;
dr=mij-1;
}
}
cout<<sol+1;
return 0;
}