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#include <fstream>
using namespace std;
int v[16005],k,n;
ifstream cin("transport.in");
ofstream cout("transport.out");
bool ok(int c) {
int tr=0,i,sc=0;
for(i=1; i<=n; i++) {
if(v[i]>c) return 0;
if(sc+v[i]<=c)
sc=sc+v[i];
else {
tr++;
sc=v[i];
}
}
if(sc>0)
tr++;
return tr<=k;
}
int bs(int st,int dr)
{
int med,last=-1;
while(st<=dr) {
med=(st+adr)/2;
if(ok(med))
{
last=med;
dr=med-1;
}
else
st=med+1;
}
return last;
}
int main() {
int i,s,ans;
cin>>n>>k;
for(i=1;i<=n;i++)
{
cin>>v[i];
s=s+v[i];
}
ans=bs(1,s);
cout<<ans;
return 0;
}