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