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#include <fstream>
using namespace std;
ifstream f("transport.in");
ofstream g("transport.out");
int v[16001], n, k;
bool e_bun(int c){
int s, trans=0, curent=0;
for (int i=0; i<n; i++){
s+=v[i];
if (s>c){
if (curent==0){
return false;
}
else{
trans++;
s=0;
curent=0;
}
}
curent++;
}
if (trans>k){
return false;
}
return true;
}
int main() {
f>>n>>k;
for (int i=0; i<n; i++){
f>>v[i];
}
int pas=1<<14, c=0;
while (pas!=0){
if (pas+c<=n && !e_bun(c)){
c+=pas;
}
pas/=2;
}
g<<c+(pas+1)*2;
return 0;
}