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#include <fstream>
using namespace std;
long long n,k,i,st,dr,mid,s,nr,maxi;
long long v[16001];
long long sol;
long long transport(long long volum)
{
long long j,trans=0,sum=0;
for(j=1; j<=n; j++)
{
if(sum + v[j] <= volum)
sum += v[j];
else
{
sum=v[j];
trans++;
}
}
trans++;
return trans;
}
int main()
{ ifstream f("transport.in");
ofstream g("transport.out");
f>>n>>k;
for(i=1;i<=n;i++)
{
f>>v[i];
s+=v[i];
if(maxi < v[i])
maxi=v[i];
}
st=maxi;
dr=s;
while(st<=dr)
{
mid=(st+dr)/2;
nr=transport(mid);
if(nr<=k)
{
dr=mid-1;
sol=mid;
}
else
{
st=mid+1;
}
}
g<<sol;
return 0;
}