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#include <fstream>
using namespace std;
ifstream f("transport.in");
ofstream g("transport.out");
const int NMax=16005;
int n, a[NMax], k, solutie, Max;
bool ok(int m)
{
int contor=1, suma=0;
for(int i=1; i<=n; i++)
{
suma += a[i];
if(suma > m) contor++, suma=a[i];
}
if(k>=contor) return 1;
else return 0;
}
void binar()
{
int s, d, mijl;
s=Max; d=16000*16000;
while(s <= d)
{
mijl = (s+d)/2;
if(ok(mijl))
{
solutie=mijl;
d=mijl-1;
}
else s=mijl+1;
}
}
int main()
{
f>>n>>k;
for(int i=1; i<=n; i++)
{
f>>a[i];
Max = max(Max,a[i]);
}
binar();
g<<solutie<<'\n';
return 0;
}