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#include <iostream>
#include <fstream>
#define NMAX 16001
using namespace std;
ifstream fin("transport.in");
ofstream fout("transport.out");
int v[NMAX], m, n, k, i, smax;
int main()
{
fin>>n>>k;
m=0;
for(i=0; i<n; i++)
{
fin>>v[i];
smax+=v[i];
if(v[i]>m) m=v[i];
}
int st, dr, mij, sol, s=NMAX, nr=0;
st=m;
dr=smax;
sol=-1;
while(st<=dr)
{
mij=(st+dr)/2;
s=0;
nr=1;
for(i=0; i<n; i++)
{
if(s+v[i]<=mij)
{
s+=v[i];
}
else
{
nr++;
s=v[i];
}
}
if(nr>k)
{
st=mij+1;
}
else
{
sol=mij;
dr=mij-1;
}
}
fout<<sol;
return 0;
}