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#include <fstream>
using namespace std;
ifstream f("transport.in");
ofstream g("transport.out");
int n,k,maxim,i,l,r,camion,t,m;
int x[16003];
int main()
{
f>>n;
f>>k;
maxim=0;
for(i=1;i<=n;++i) {
f>>x[i];
if(x[i]>maxim) maxim=x[i];
}
l=maxim;
r=257000000;
while(l<r)
{
camion=0;
t=1;
m=(l+r)/2;
for(i=1;i<=n;++i)
{
if(camion+x[i]>m) ++t,camion=x[i];
else camion=camion+x[i];
}
if(t>k) l=m+1;
else r=m;
}
g<<l;
return 0;
}