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#include <fstream>
using namespace std;
ifstream fi ("transport.in");
ofstream fo ("transport.out");
int a[16007],i,st,dr,k,n,mij,sol;
bool verif (int x)
{
int ndrum=1,c=0;
for (i=1;i<=n;i++)
{
c+=a[i];
if (c>x)
{
c=a[i];
ndrum++;
}
if (ndrum>k) return 0;
}
return 1;
}
int main()
{
fi>>n>>k;
for (i=1;i<=n;i++) {fi>>a[i];st=max(st,a[i]);}
dr=16000*16000;
while (st<=dr)
{
mij=(st+dr)/2;
if (verif(mij))
{
sol=mij;
dr=mij-1;
}
else st=mij+1;
}
fo<<sol;
return 0;
}