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#include <iostream>
#include <fstream>
using namespace std;
ifstream f("transport.in");
ofstream g("transport.out");
int n, k, a[16004], sum, maxi;
int main()
{
f>>n>>k;
for(int i=1; i<=n; i++)
{f>>a[i];
maxi=max(a[i],maxi);
sum=sum+a[i];}
int st,dr,mij,i,cnt,nr=0;
st=maxi;
dr=sum;
while(st<=dr)
{
mij=(st+dr)/2;
cnt=0;
sum=0;
for(i=1; i<=n; i++)
{
if(sum+a[i]<=mij&&a[i]<=mij) sum=sum+a[i];
else {cnt++; sum=a[i];}
}
if(sum<=mij) cnt++;
if(cnt>k) st=mij+1;
else if(cnt<=k) dr=mij-1, nr=mij;
}
g<<nr;
}