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#include <fstream>
using namespace std;
ifstream f("transport.in");
ofstream g("transport.out");
long long m,st,dr,v[16005],i,n,k,q,qq,rez;
int bun(int S)
{
int C=0,P=1;
if (S<qq) return 0;
for(i=1; i<=n; i++)
if (C+v[i]<=S) C+=v[i];
else C=v[i],P++;
if (P<=k) return 1;
return 0;
}
void cautbin()
{
int st=1,dr=q;
while (st<=dr) {
m=(st+dr)/2;
if (bun(m)==1) dr=m-1,rez=m;
else st=m+1;
}
}
int main()
{
f>>n>>k;
for(i=1; i<=n; i++) f>>v[i],q+=v[i],qq=max(qq,v[i]);
cautbin();
g<<rez;
f.close();
g.close();
return 0;
}