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#include <fstream>
#include <vector>
using namespace std;
int caut(int st,int dr,int k,vector<int>a)
{
int rez;
while(st<=dr)
{
int m=(st+dr)/2;
int x=1,s=0;
for(auto c:a)
{
if(s+c>m)
{
x++;
s=c;
}
else
{
s+=c;
}
}
if(x<=k)
{
dr=m-1;
rez=m;
}
else
{
st=m+1;
}
}
return rez;
}
ifstream fin("transport.in");
ofstream fout("transport.out");
int main()
{
int n,maxx,s,k;
fin>>n>>k;
vector<int>a(n);
for(int i=0;i<n;i++)
{
fin>>a[i];
s+=a[i];
maxx=max(maxx,a[i]);
}
fout<<caut(maxx,s,k,a);
}