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#include <iostream>
#include <fstream>
using namespace std;
int v[16001];
ifstream fin("transport.in");
ofstream fout("transport.out");
int main()
{
int n,nr,i,st=0,dr=0,cap=0,mij,t,s;
fin>>n>>nr;
for(i=1; i<=n; i++){
fin>>v[i];
if(st<v[i])
st=v[i];
}
dr=256000000;
while(st<=dr){
mij=(st+dr)/2;
t=1,s=0;
for(i=1; i<=n; i++){
s=s+v[i];
if(s>mij){
t++;
s=v[i];
}
}
if(t>nr){
st=mij+1;
}
else{
dr=mij-1;
cap=mij;
}
}
fout<<cap;
return 0;
}