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#include <iostream>
#include<fstream>
using namespace std;
ifstream in("transport.in");
ofstream out("transport.out");
int v[16000],s,mx,i,k,n;
int test(int K)
{
int i,S=0,T=0;
for(i=0;i<n;i++)
{
if(S+v[i]<K)
S+=v[i];
else
{T++;S=v[i];}
}
return T;
}
int manevrabinara(int st,int dr)
{
int mij=(st+dr)/2,tst=test(mij);
cout<<st<<" "<<dr<<" "<<tst<<" "<<mij<<endl;
if(st>dr)
return 0;
if(tst==k)
return mij;
if(tst<k)
return manevrabinara(st,mij-1);
if(tst>k)
return manevrabinara(mij+1,dr);
}
int main()
{
in>>n>>k;
mx=0,s=0;
for(i=0; i<n; i++)
{
in>>v[i];
if(v[i]>mx)
mx=v[i];
s+=v[i];
}
// cout<<mx<<" "<<s<<endl;
out<<manevrabinara(mx,s);
// cout<<test(8);
return 0;
}