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#include<fstream>
using namespace std;
ifstream f("transport.in");
ofstream g("transport.out");
int k,a[16001],n,i,st,dr,mij;
int nrtrans(int x)
{
int S=0,tr=1;
for(int i=1;i<=n;i++)
{
if(a[i]>x)
return 0;
S+=a[i];
if(S>x)
{
S=a[i];
tr++;
}
}
if(tr>k)
return 0;
else
return 1;
}
int main ()
{
f>>n>>k;
int S=0;
for(i=1;i<=n;i++)
{
f>>a[i];
S+=a[i];
}
st=1;
dr=S;
while(st<=dr)
{
mij=st+(dr-st)/2;
if(nrtrans(mij)==1)
dr=mij-1;
else
st=mij+1;
}
g<<mij;
}