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#include <iostream>
#include <fstream>
#define N 16010
using namespace std;
ifstream f("transport.in");
ofstream g("transport.out");
long n,k,v[N],i,j,st,dr,max1=-13,mij,nr=0,rez,sum=0;
void bin(long st,long dr)
{
long nr,sum,mij;
if(st<dr)
{
mij=(st+dr)/2;
sum=0;
nr=0;
for(i=1;i<=n;i++)
{
sum=sum+v[i];
if(sum>=mij)
{
nr++;
sum=v[i];
}
}
if(nr==k)
rez=mij;
else
if(nr<k)
{
bin(st,mij);
}
else
if(nr>k)
{
bin(mij+1,dr);
}
}
}
int main()
{
f>>n>>k;
for(i=1;i<=n;i++)
{
f>>v[i];
if(max1<v[i])
{
max1=v[i];
}
sum=sum+v[i];
}
st=max1;
dr=sum;
bin(st,dr);
g<<rez;
}