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#include <fstream>
using namespace std;
int n,i,k,mini,v[20000];
int ctb(int st, int dr)
{
int s,nr,i,m;
s=0;
nr=1;
m=(st+dr)/2;
if(st==dr)
return st;
for(i=n; i>0; i--)
{
if(s+v[i]>m)
{
s=v[i];
nr++;
}
else
s+=v[i];
}
if(nr>k)
return ctb(m+1,dr);
return ctb(st,m);
}
int main()
{
ifstream f("transport.in");
ofstream g("transport.out");
f>>n>>k;
for(i=1; i<=n; i++)
{
f>>v[i];
if(mini<v[i])
mini=v[i];
}
g<<ctb(mini,256000000);
f.close(); g.close();
}