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